fix(screenshare): stop using exact for specified device sharing (#1031)
fix(screenshare): stop using exact for specified device sharing (#1031)

Overconstrainederror occurs when calling gum with "exact"
when on URLs with a hash. To get around this, remove
"exact". Add handling for specified device not being
found, as we can no longer rely on "exact". This
still leaves open the possibility of the wrong
camera being accessed.

jiyeyuran/lib-jitsi-meet,jitsi/lib-jitsi-meet,jitsi/lib-jitsi-meet,damencho/lib-jitsi-meet