Change Taskbar Icon Colors with theme

Description of the issue:
The taskbar buttons do not change color when you apply a new theme, which makes them unreadable.

Steps to Reproduce:

  1. Launch Brave
  2. Apply this theme:
  3. Look at the taskbar.

Actual Result:

Expected Result:
There isn’t an expected result yet, but on Chrome it would have turned green as in the screenshot on the themebeta page.

Reproduces how often:

Brave Version:
Brave release - v1.23.71

Reproducible on current live release:

Additional information:
I’m using Windows 10, but since it’s not related to that I don’t really want to pull up the exact version number.
It would also be very epic if we could have our own picture be on the new tab page when there isn’t a sponsored image showing B)