* Ignore `disabled` when adpative stream is enabled.
Due to interplay of adaptive stream/visibility/dynacast, when adaptive
stream is enabled, subscribed track forces visibility and starts
streaming at low quality. This would trigger a render on client and
trigger a visibility update.
So, even if a migration disables a track, upon migration complete and
subscription bind, ignore disable and stream.
* don't hold lock during callback
* don't need to store pubMuted
* don't need to hold settings lock for pub muted
d20811d1c2