Fix loading of playlists
Fix loading of playlists

- Loading playlists from DB did not work. Hence, no playlists were shown after reloading the app. Newly created playlists could be used during a session, but then again they disappeared on reload.
- This bug had been introduced by commit a70053deb7

owncloud/music,paulijar/music,owncloud/music,Faldon/music,paulijar/music,Faldon/music,Faldon/music,owncloud/music,Faldon/music,owncloud/music,Faldon/music,paulijar/music,owncloud/music,paulijar/music,paulijar/music