BUG: USB autoplay prioritization err: videofiles are priorized over playlist

[viliman]

Autoplay of playlists does not work if you have video files on USB-disk and playlist is saved on USB-disk (videofiles are priorized over playlist)

The preference is:

1. usb disk autoplay list
2. usb disk autoplay all files in root
3. internal autoplay list

Especially with the goal that RAME booting without USB will play internal autoplay. If USB is attached, the playing is stopped and autoplay of USB is started. If USB is removed, the autoplay of internal autoplay list is restarted.

[viliman]

Also currently rame internal playlist are ranked too high in priority list.