fix(extendTab): scrambled video in external tab when E2EE enabled

Maximilian Fußrequested to merge
m.fuss/web-app:3414-backport-hide-pop-out-button-for-e2-ee-meetings-to-v26-1-x into release/v2.8.x

fix(extendTab): scrambled video in external tab when E2EE enabled

The extended tab button is hided when e2ee is active for the room.

closes #3414 (closed)

(cherry picked from commit 2f8282c5)

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