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

Maximilian Fußrequested to merge
m.fuss/web-app:3611-backport-waiting-room-keep-controls-enabled-after-being-moved-to-v26-3-x-v2-10-x into release/v2.10.x

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

Closes #3611 (closed)

(cherry picked from commit 577ab9c7)

Closes #3611 (closed)

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