Favicons are not visible prominently in Dark mode

[GeetaSarvadnya]

Description

favicons are not visible prominently in Dark mode

Steps to Reproduce

1. Open Brave 1.18.x
2. Change appearance settings to Dark mode
3. Visit brave://settings/cookies
4. Open a PT window and visit any site
5. Come back to brave://settings/cookies again
6. favicons are not visible prominently in Dark mode

Actual result:

favicons are not visible prominently in Dark mode

Expected result:

Favicons should be lighter color in dark theme

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.18.57 Chromium: 87.0.4280.66 (Official Build) beta (64-bit)
Revision	fd98a29dd59b36f71e4741332c9ad5bda42094bf-refs/branch-heads/4280@{#1432}
OS	Windows 10 OS Version 2004 (Build 19041.572)

Version/Channel Information:

• Can you reproduce this issue with the current release? No
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

cc: @brave/legacy_qa @rebron @karenkliu

[karenkliu]

Yeah just make it the same color as the globe icon to its left. Not sure the theme isn't picking it up.

[PandaSupremacy]

Make the colours of the favicons save as the ones in the settings so as they they stand out in the particular screen