For playlist-autostart, PLAYLIST_PLAY is used now which does not restart
the current item if there is already one running.

This avoids restart of the same item in a quick succession, and thus
workarounds the issue described in refs #11488.

(cherry picked from commit e6dfd01f3dc2ff7b34006d214e57524f82e5ccd6)
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>