Silence AppArmor logs for Tor Browser

This will make it easier for developers to debug issues, easier for help desk to analyze bug reports, and less confusing to power-users who happen to read logs.

This ticket was created as a follow-up to #12658 (closed), that was itself a follow-up on #12635-note_10.

Feature Branch: torbrowser-launcher:feature/14606-silence-tor-browser-apparmor-logs

Related issues

Blocks #13234 (closed)

Original created by @intrigeri on 14606 (Redmine)

Edited Nov 22, 2019 by intrigeri

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