[3.0] Audio muted when closing duplicated tab

[gabriellpr]

Describe the bug
When the user joins a meeting, duplicates the tab, and closes it, the audio gets muted on the main meeting.

To Reproduce
Steps to reproduce the behavior:

1. Create a meeting
2. Join audio, then duplicate the tab
3. Close the opened tab
4. The audio will be muted

Video

[gustavotrott]

It happens at this line:

bigbluebutton/bigbluebutton-html5/imports/ui/components/app/component.jsx

Line 213 in 0f98f59

AudioService.muteMicrophone(toggleVoice);

This action seems necessary to prevent capturing audio while the user confirms if they want to exit.

The idea is alright but it should perform some validations to ensure that the current tab is the one sharing audio and not a different tab of the same user.

1. Verify if the audio component is currently sharing audio.
2. If the current tab is confirmed to be sharing audio, send the mutation to mute itself.