Thumbnails: add media option no-iteract

Because vlc-android and the medialibrary now share the same libvlc
instance, dialogs spawned in libvlc while opening a media to generate a
thumbnail will be shown to user. This should not happen, and with the
no-interact option it won't.
8 jobs for !660 with no-interact in 7 minutes and 33 seconds (queued for 6 seconds)
latest merge request