Lobby participants smooth joining

[Antreesy]

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Steps to reproduce

1. Enable lobby
2. Join as a guest
3. Wait for lobby to be disabled to join a call

Expected behaviour

Lobby screen might show 'I"m ready" button, that replace input an log in button with 'Waiting for moderator to disable the lobby"

If 'I"m ready', don't show a media settings again and directly join the call
If hasn't been set, keep the audio/video disabled state

Actual behaviour

Tell us what happens instead

Talk app

Talk app version: latest