fix(subroom-audio): prevent duplicate room connection & permanent active whisper

Albrecht Weicherequested to merge
a.weiche/web-app:3328-backport-subroom-audio-prevent-duplicate-websocket-connection-attempts into release/v2.8.x

fix(subroom-audio): prevent duplicate room connection & permanent active whisper

Closes #3304 (closed)

(cherry picked from commit 58a78734)

Closes #3328 (closed)

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