[Breakout Rooms] Ensure that waiting room cannot be rendered multiple times on the page

[dfosco]

[!NOTE] Review once https://github.com/miroapp/app-examples/pull/235 is merged and rebased here.

When facilitator enters and drops facilitator mode multiple times, waiting room is being re-rendered:

This should fix it.

Bug noticed during development of https://github.com/miroapp/app-examples/pull/235, wait for it to be merged to review.

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