Add fallback devices to DeviceMediaManager
Add fallback devices to DeviceMediaManager

When there is no selected device (either because the selected one was
removed or because there were no devices before) but there are other
devices now a fallback device is automatically selected.

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

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed