mac - set file mode and group owner for pkg-installed Brave.app

[petemill]

…appropriate to app update feature

Fix #13109
Fix #13106

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.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

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

[bsclifton]

Changes worked great in the test executable you sent to me 😄 👍

[bsclifton]

master 076c142
0.22.x 6174477
0.21.x 6c96cb3
0.20.x 0082152