fix: background effect gets lost when switching device

Slavcho Cvetanovskirequested to merge
s.cvetanovski/k3k-web-frontend:2336-background-effect-lost-lobby into main

fix: background effect gets lost when switching device

This MR fixes the lost in background effect in Lobby when switching between video devices or just by choosing the background effect and then refreshing the page and turning the video on.

Closes #2336

Closes #2336

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