Wallet icon needs to more lighter similar to Talk and Bookmarks

[srirambv]

Description

Wallet icon needs to more lighter similar to Talk and Bookmarks

Steps to Reproduce

1. Install nightly build
2. Set browser to dark theme
3. Wallet is barely visible but on hover shows the correct hover state

Actual result:

No Hover	On hover

Expected result:

Should be same as the other two default buttons

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	1.37.53 Chromium: 98.0.4758.102 (Official Build) nightly (arm64)
Revision	273bf7ac8c909cde36982d27f66f3c70846a3718-refs/branch-heads/4758@{#1151}
OS	macOS Version 12.1 (Build 21C52)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• 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: @rebron @simonhong

[simonhong]

This is duplicated issue - #21100

[simonhong]

Wallet icon was not updated when theme changed during the runtime.
New window after changing theme has proper wallet icon color.

[srirambv]

Brave	1.37.84 Chromium: 99.0.4844.51 (Official Build) beta (64-bit)
Revision	d537ec02474b5afe23684e7963d538896c63ac77-refs/branch-heads/4844@{#875}
OS	☑️ Linux	☑️ Windows 11 Version Dev (Build 22523.1000)	☑️ macOS Version 12.0.1 (Build 21C52)
	Verified steps from issue description Verified wallet icon is clearly visible on both dark and light mode
Light theme	21172-Linux.Light.mp4	21172-Windows.Light.mov	21172-macOS.Light.mov
Dark theme	21172-Linux.Dark.mp4	21172-Windows.Dark.mov	21172-macOS.Dark.mov