Revert https://github.com/brave/browser-laptop/commit/7527e4f6718e905…

[luixxiul]

…6b5445a2091f2a6c9b90355bc

See: #3653 (comment), #9034 (comment)

Follow-up to #9034

Auditors:

Test Plan:

1. Click Bravery panel button next to the URL bar
2. Make sure darkening effect does not occur

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[cezaraugusto]

++