fix cover detection - double to single quotes - fix #134
fix cover detection - double to single quotes - fix #134

uycarumba/music,jhs-s/owncloud-music,owncloud/music,DavidPrevot/music,owncloud/music,pellaeon/music,Faldon/music,pellaeon/music,jhs-s/owncloud-music,uycarumba/music,owncloud/music,paulijar/music,DavidPrevot/music,uycarumba/music,owncloud/music,paulijar/music,owncloud/music,Faldon/music,pellaeon/music,uycarumba/music,pellaeon/music,Faldon/music,paulijar/music,paulijar/music,Faldon/music,DavidPrevot/music,DavidPrevot/music,jhs-s/owncloud-music,paulijar/music,Faldon/music