fix(dropdown): fix displaying custom clearIndicator prop

[kolaps33]

Pull request checklist

Description of changes

add condition to the style if there is custom clearIndicator given, then don't display default background image

Focus areas to test

Tests are done via screener :

[msft-github-bot]

Perf Analysis

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
BaseButton	mount	864	897	5000
ButtonNext	mount	423	425	5000
Checkbox	mount	1568	1623	5000
CheckboxBase	mount	1323	1354	5000
CheckboxNext	mount	1554	1597	5000
ChoiceGroup	mount	4977	4935	5000
ComboBox	mount	946	930	1000
CommandBar	mount	7635	7623	1000
ContextualMenu	mount	13351	12914	1000
DefaultButton	mount	1111	1089	5000
DetailsRow	mount	3571	3549	5000
DetailsRowFast	mount	3513	3552	5000
DetailsRowNoStyles	mount	3397	3335	5000
Dialog	mount	1461	1498	1000
DocumentCardTitle	mount	1789	1831	1000
Dropdown	mount	2439	2435	5000
FocusZone	mount	1769	1779	5000
IconButton	mount	1714	1732	5000
Label	mount	339	359	5000
Link	mount	488	487	5000
LinkNext	mount	501	519	5000
MenuButton	mount	1439	1447	5000
Nav	mount	3304	3180	1000
Panel	mount	1467	1431	1000
Persona	mount	821	820	1000
Pivot	mount	1394	1399	1000
PivotNext	mount	1348	1347	1000
PrimaryButton	mount	1224	1294	5000
SearchBox	mount	1264	1257	5000
Slider	mount	1499	1503	5000
SliderNext	mount	2010	1944	5000
Spinner	mount	458	426	5000
SplitButton	mount	3146	3175	5000
Stack	mount	502	513	5000
StackWithIntrinsicChildren	mount	1905	1939	5000
StackWithTextChildren	mount	4957	4941	5000
TagPicker	mount	2827	2803	5000
Text	mount	446	422	5000
TextField	mount	1421	1421	5000
ThemeProvider	mount	2839	2868	5000
ThemeProvider	virtual-rerender	525	535	5000
Toggle	mount	913	922	5000
ToggleNext	mount	893	864	5000
button	mount	96	110	5000

Perf Analysis (Fluent)

Perf comparison

Status	Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
🎯	Avatar.Fluent	0.44	0.49	0.9:1	2000	874
🦄	Button.Fluent	0.1	0.18	0.56:1	5000	521
🔧	Checkbox.Fluent	0.61	0.31	1.97:1	1000	608
🦄	Dialog.Fluent	0.14	0.21	0.67:1	5000	716
🔧	Dropdown.Fluent	3.27	0.43	7.6:1	1000	3268
🔧	Icon.Fluent	0.14	0.05	2.8:1	5000	677
🦄	Image.Fluent	0.07	0.11	0.64:1	5000	353
🔧	Slider.Fluent	1.57	0.35	4.49:1	1000	1574
🔧	Text.Fluent	0.07	0.02	3.5:1	5000	330
🦄	Tooltip.Fluent	0.1	17.69	0.01:1	5000	475

🔧 Needs work     🎯 On target     🦄 Amazing

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
ImageMinimalPerf.default	363	328	1.11:1
CardMinimalPerf.default	553	511	1.08:1
ButtonMinimalPerf.default	164	155	1.06:1
FormMinimalPerf.default	385	365	1.05:1
HeaderMinimalPerf.default	350	334	1.05:1
HierarchicalTreeMinimalPerf.default	421	402	1.05:1
LabelMinimalPerf.default	396	376	1.05:1
TextMinimalPerf.default	342	325	1.05:1
Image.Fluent	353	335	1.05:1
DividerMinimalPerf.default	350	336	1.04:1
ListCommonPerf.default	948	914	1.04:1
ListWith60ListItems.default	1086	1047	1.04:1
SegmentMinimalPerf.default	336	323	1.04:1
MenuMinimalPerf.default	840	816	1.03:1
RefMinimalPerf.default	196	190	1.03:1
ToolbarMinimalPerf.default	933	910	1.03:1
Dialog.Fluent	716	695	1.03:1
CarouselMinimalPerf.default	437	428	1.02:1
ChatMinimalPerf.default	588	576	1.02:1
ChatWithPopoverPerf.default	453	446	1.02:1
DialogMinimalPerf.default	717	706	1.02:1
FlexMinimalPerf.default	280	274	1.02:1
InputMinimalPerf.default	1012	996	1.02:1
LoaderMinimalPerf.default	715	701	1.02:1
MenuButtonMinimalPerf.default	1209	1191	1.02:1
ProviderMinimalPerf.default	840	825	1.02:1
RadioGroupMinimalPerf.default	392	383	1.02:1
IconMinimalPerf.default	652	640	1.02:1
Checkbox.Fluent	608	594	1.02:1
Slider.Fluent	1574	1542	1.02:1
AttachmentSlotsPerf.default	1122	1110	1.01:1
DropdownMinimalPerf.default	3261	3228	1.01:1
EmbedMinimalPerf.default	1846	1822	1.01:1
ListNestedPerf.default	857	847	1.01:1
TextAreaMinimalPerf.default	454	448	1.01:1
CustomToolbarPrototype.default	3873	3825	1.01:1
TreeWith60ListItems.default	215	213	1.01:1
Dropdown.Fluent	3268	3242	1.01:1
AvatarMinimalPerf.default	468	470	1:1
ButtonSlotsPerf.default	581	581	1:1
ItemLayoutMinimalPerf.default	1282	1276	1:1
ListMinimalPerf.default	452	451	1:1
PortalMinimalPerf.default	117	117	1:1
StatusMinimalPerf.default	659	660	1:1
TableManyItemsPerf.default	2106	2096	1:1
AlertMinimalPerf.default	276	279	0.99:1
BoxMinimalPerf.default	324	328	0.99:1
ChatDuplicateMessagesPerf.default	399	404	0.99:1
CheckboxMinimalPerf.default	2762	2780	0.99:1
DropdownManyItemsPerf.default	1336	1343	0.99:1
PopupMinimalPerf.default	267	271	0.99:1
ProviderMergeThemesPerf.default	2133	2144	0.99:1
ReactionMinimalPerf.default	363	366	0.99:1
SliderMinimalPerf.default	1542	1552	0.99:1
SplitButtonMinimalPerf.default	3335	3352	0.99:1
TableMinimalPerf.default	375	378	0.99:1
TooltipMinimalPerf.default	733	738	0.99:1
VideoMinimalPerf.default	584	592	0.99:1
Avatar.Fluent	874	881	0.99:1
Button.Fluent	521	526	0.99:1
Icon.Fluent	677	684	0.99:1
Tooltip.Fluent	475	479	0.99:1
AccordionMinimalPerf.default	127	130	0.98:1
GridMinimalPerf.default	636	652	0.98:1
LayoutMinimalPerf.default	378	387	0.98:1
Text.Fluent	330	337	0.98:1
AttachmentMinimalPerf.default	141	146	0.97:1
HeaderSlotsPerf.default	750	773	0.97:1
TreeMinimalPerf.default	822	845	0.97:1
AnimationMinimalPerf.default	593	616	0.96:1

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 08f405e64129cbe870660edcafb385e90b977387 (build)