fix form button colors and fix color bleed

[AnthonyLedesma]

Description

Closes #2460

The original approach using styles did not work because there are other situations where the style would bleed. Change here fixes the bleed reported in #2460 and keeps the original bug resolved by ensuring the form block submit button does not apply default colors to its color component but instead inherits from the theme.

Types of changes

Remove style changes. Allow form block submit button to inherit colors from stylesheets.

How has this been tested?

Tested manually with TwentyTwentyThree and with Go theme.

Acceptance criteria

This should resolve the color bleed reported in the linked issue. It should also continue to resolve the originally attempted fix. Original bug behavior can be seen here: #2449

Checklist:

• My code is tested
• My code follows accessibility standards
• My code has proper inline documentation
• I've included any necessary tests
• I've included developer documentation
• I've added proper labels to this pull request

[godaddy-wordpress-bot]

Download coblocks.zip: https://output.circle-artifacts.com/output/job/36cddc02-9139-4c47-8320-53d837475c9a/artifacts/0/tmp/artifacts/coblocks-.zip

[cypress]

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Test summary

401 • 0 • 2 • 0

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Run details

Project	CoBlocks
Status	Passed
Commit	cb31def
Started	Dec 20, 2022 6:00 PM
Ended	Dec 20, 2022 6:06 PM
Duration	06:11 💡
OS	Linux Ubuntu -
Browser	Multiple

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[godaddy-wordpress-bot]

Performance Test Results:

index	master	fix-2460	change %
focus	173.2	149.68	-13.58%
inserterHover	81.91	84.63	3.32%
inserterOpen	100.83	96.62	-4.18%
inserterSearch	104.61	97.18	-7.1%
load	56766.5	57336.4	1%
maxFocus	229.49	228.77	-0.31%
maxInserterHover	101.3	96.15	-5.08%
maxInserterOpen	227.29	226.51	-0.34%
maxInserterSearch	168.23	164.83	-2.02%
maxType	191.14	133.1	-30.37%
minFocus	135.09	120.08	-11.11%
minInserterHover	77.01	73.69	-4.31%
minInserterOpen	78.51	77.54	-1.24%
minInserterSearch	80.86	73.43	-9.19%
minType	65.83	63.37	-3.74%
type	86.43	76.96	-10.96%

[EvanHerman]

Appears to be working well on my end. Nice work! 💯