Aligned brave wallet keys

[luixxiul]

• 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).

Fix #5807 into

Auditors: @bbondy

Test Plan:

1. Open about:preferences#payments
2. Click "Backup your wallet"

[bbondy]

++