Picking "Mute Tabs" for a tab page toggles mute state (instead of muting)

[bsclifton]

• Did you search for similar issues before submitting this one?
  Yes

• Describe the issue you encountered:
  When you have multiple tab pages, you can mute the other tab page like so:
  

When this executes, it doesn't mute the tabs... instead it sets them to the opposite of what they are:

• if the video was playing, it will be muted

• If the video was muted, it will be playing

• Platform (Win7, 8, 10? macOS? Linux distro?):
  macOS (although it's a global problem)

• Brave Version (revision SHA):
  Latest (master)

• Steps to reproduce:

  1. Open Preferences > Tabs and set tab page size at 6
  2. Open https://www.youtube.com/watch?v=kLiLOkzLetE in 6 different tabs
  3. Mute tabs 1, 3, 6
  4. Make a 7th tab, load Brave.com
  5. In the tab page header, right click tab page 1 and pick "Mute tab"

• Actual result:

  • on tab page 1
    • tabs 1, 3, and 6 will have their audio restored
    • tabs 2, 4, 5 will be muted

• Expected result:
  All tabs on tab page 1 should be muted

• Will the steps above reproduce in a fresh profile? If not what other info can be added?

• Is this an issue in the currently released version?
  I believe so

• Can this issue be consistently reproduced?
  yes

• Extra QA steps:
  1.
  2.
  3.

• Screenshot if needed:

• Any related issues: