fix playlist order items order by id

git-svn-id: https://plugins.svn.wordpress.org/html5-mp3-player-with-playlist/trunk@798700 b8457f37-d9ea-0310-8a92-e5e31aec5664
Playlist items order by id

git-svn-id: https://plugins.svn.wordpress.org/html5-mp3-player-with-playlist/trunk@798701 b8457f37-d9ea-0310-8a92-e5e31aec5664