Fixes WebTorrent not being enabled

[NejcZdovc]

Resolves #10767

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:

• clean profile
• go to https://webtorrent.io/free-torrents/
• try to download torrent file and try to click on magnet link
• make sure that is handled by the WebTorrent
• go to extension page and disable WebTorrent
• go to https://webtorrent.io/free-torrents/
• try to download torrent file and try to click on magnet link
• make sure that file is downloaded and that you see handler for the link
• go to extension page and enable WebTorrent
• try to download torrent file and try to click on magnet link
• make sure that is handled by the WebTorrent

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]

Works great! Here is where it all originally went downhill:
NejcZdovc@c050f3b

Code changes look good- test plan works great! 😄 👍

[bsclifton]

master 285ca53
0.23.x 03e86dd
0.22.x 8e7bbbb