Fix shields button background

[samartnik]

Description

This is follow up for #26155

Steps to reproduce

1. Goto wikipedia.com or facebook.com
2. Shields button background is wrong (see picture)

Actual result

Shields button background is wrong

Expected result

Shields button background is right

Issue reproduces how often

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version?
• Can you reproduce this issue with the current Play Store Beta version?
• Can you reproduce this issue with the current Play Store Nightly version?

Device details

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Brave version

Website problems only

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

Additional information

[kjozwiak]

Verification PASSED on Pixel 6 running Android 13 using the following build(s):

Brave | 1.47.135 Chromium: 108.0.5359.128 (Official Build) beta (32-bit)
--- | ---
Revision | 1cd27afdb8e5d057070c0961e04c490d2aca1aa0-refs/branch-heads/5359@{#1185}
OS | Android 13; Build/TQ1A.221205.011

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