Fixes Audio indicator if tab muted and video stops playing

[TheKinshu]

Fix #12569

I have added something to check if the audio in the tab is muted or not within the audioState file. I have also made added a test for the new changes.

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

[ryanml]

@TheKinshu thank you for your contribution :D We'll see that it gets reviewed.

I left some feedback regarding the code formatting, as it is causing the linter fail.

A tip is to run npm run lint before you push your changes, it will let you know what needs to be changed and how. Let me know if you have any questions!

[TheKinshu]

@ryanml Thanks for the reply :). I'll fix the linter error right away.

[bsclifton]

Great fix- thanks for including the test too 😄 👍