fix(large-video): ensure switch to local video when all others leave  (#1607)
fix(large-video): ensure switch to local video when all others leave  (#1607)

* fix(large-video): ensure switch to local video when all others leave

This handles the case where User A and B are in a call and B has
no audio or video. Then B leaves. User A would see User B left
on large video. Instead, User A should see self view on large.

* squash: always update large video if it is empty

* squash: add largeVideo check for filmstrip only mode

bgrozev/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,jitsi/jitsi-meet,gpolitis/jitsi-meet,bgrozev/jitsi-meet,bgrozev/jitsi-meet