fix(waiting-room): keep media controls enabled after moving to waiting room

Maximilian Fußrequested to merge
m.fuss/web-app:3590-waiting-room-keep-controls-enabled-after-being-moved into release/v2.9.x

fix(waiting-room): keep media controls enabled after moving to waiting room

Closes #3590 (closed)

Closes #3590 (closed)

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