fix(room): return participants to lobby when meeting closes

Maximilian Fußrequested to merge
m.fuss/web-app:3562-backport-room-return-participants-to-lobby-when-meeting-closes-to-26-3-x into release/v2.10.x

fix(room): return participants to lobby when meeting closes

Closes #3562 (closed)

(cherry picked from commit fc48dc6e)

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