Display brave icon on CheckDefaultBrowserDialog

[luixxiul]

Fixes #11041

Auditors:

Test Plan:

1. Change the default browser from Brave
2. Open Brave
3. Make sure the lion image is displayed on the dialog

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).
• Tagged reviewers and labelled the pull request as 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]

++ nice catch

[cezaraugusto]

per branch sha:
master 7bfc2e2
0.20.x 011d187
0.19.x 18ecd5a