fix(ExtendedTab): fix endless loading of extended tab

Michael Holstrequested to merge
m.holst/k3k-web-frontend:release/v2.7.x into release/v2.7.x

fix(ExtendedTab): fix endless loading of extended tab

closes opentalk/product/tickets#108 (closed) #3269 (closed) #3327 (closed)

Conflicts:

app/src/components/ParticipantWindow/fragments/VideoOverlay.tsx

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