Set initial media state based on the current tracks
Set initial media state based on the current tracks

This should not make any difference, as the configuration reflects the
current tracks, but it makes it more consistent with
"_updateMediaAvailability()" and prepares it for upcoming changes.

Signed-off-by: Daniel Calviño Sánchez <bd7629e975cc0e00ea7cda4ab6a120f2ee42ac1b@gmail.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed