fix RewritePlugin initialization
fix RewritePlugin initialization

Error was introduced in 6d68a48

Dishwishy/beets,drm00/beets,Kraymer/beets,pdf/beets,MyTunesFreeMusic/privacy-policy,mathstuf/beets,SusannaMaria/beets,lightwang1/beets,madmouser1/beets,Wen777/beets,artemutin/beets,shamangeorge/beets,gabrielaraujof/beets,Andypsamp/CODjunit,asteven/beets,Freso/beets,untitaker/beets,ibmibmibm/beets,imsparsh/beets,randybias/beets,dfc/beets,krig/beets,pkess/beets,artemutin/beets,jcoady9/beets,MyTunesFreeMusic/privacy-policy,jackwilsdon/beets,tima/beets,sadatay/beets,LordSputnik/beets,arabenjamin/beets,andremiller/beets,gabrielaraujof/beets,mathstuf/beets,Andypsamp/CODfinalJUNIT,sadatay/beets,pkess/beets,multikatt/beets,ruippeixotog/beets,mried/beets,diego-plan9/beets,YetAnotherNerd/beets,randybias/beets,multikatt/beets,Wen777/beets,drm00/beets,imsparsh/beets,moodboom/beets,marcuskrahl/beets,gabrielaraujof/beets,ttsda/beets,jmwatte/beets,Kraymer/beets,kareemallen/beets,lightwang1/beets,asteven/beets,Freso/beets,swt30/beets,SusannaMaria/beets,diego-plan9/beets,LordSputnik/beets,parapente/beets,randybias/beets,mried/beets,LordSputnik/beets,m-urban/beets,Andypsamp/CODjunit,madmouser1/beets,ibmibmibm/beets,parapente/beets,ibmibmibm/beets,arabenjamin/beets,lightwang1/beets,untitaker/beets,sampsyo/beets,jayme-github/beets,marcuskrahl/beets,jmwatte/beets,jbaiter/beets,dfc/beets,ttsda/beets,shanemikel/beets,krig/beets,beetbox/beets,ruippeixotog/beets,krig/beets,madmouser1/beets,drm00/beets,bj-yinyan/beets,shanemikel/beets,PierreRust/beets,swt30/beets,jackwilsdon/beets,YetAnotherNerd/beets,multikatt/beets,dfc/beets,ruippeixotog/beets,kelvinhammond/beets,LordSputnik/beets,shanemikel/beets,artemutin/beets,m-urban/beets,parapente/beets,kelvinhammond/beets,mried/beets,Freso/beets,shamangeorge/beets,Andypsamp/CODfinalJUNIT,beetbox/beets,mried/beets,ibmibmibm/beets,jmwatte/beets,moodboom/beets,Andypsamp/CODjunit,Dishwishy/beets,xsteadfastx/beets,pkess/beets,tima/beets,jackwilsdon/beets,untitaker/beets,marcuskrahl/beets,andremiller/beets,shamangeorge/beets,Dishwishy/beets,untitaker/beets,arabenjamin/beets,xsteadfastx/beets,lengtche/beets,mosesfistos1/beetbox,lightwang1/beets,Kraymer/beets,mathstuf/beets,madmouser1/beets,kareemallen/beets,jbaiter/beets,arabenjamin/beets,kareemallen/beets,Wen777/beets,Kraymer/beets,randybias/beets,multikatt/beets,swt30/beets,mosesfistos1/beetbox,Andypsamp/CODfinalJUNIT,beetbox/beets,andremiller/beets,PierreRust/beets,drm00/beets,imsparsh/beets,MyTunesFreeMusic/privacy-policy,jmwatte/beets,gabrielaraujof/beets,jcoady9/beets,sampsyo/beets,asteven/beets,bj-yinyan/beets,ttsda/beets,pkess/beets,sampsyo/beets,ruippeixotog/beets,m-urban/beets,pdf/beets,moodboom/beets,SusannaMaria/beets,parapente/beets,sadatay/beets,lengtche/beets,mosesfistos1/beetbox,artemutin/beets,jcoady9/beets,ttsda/beets,SusannaMaria/beets,Andypsamp/CODfinalJUNIT,asteven/beets,swt30/beets,shanemikel/beets,bj-yinyan/beets,dfc/beets,mathstuf/beets,kelvinhammond/beets,m-urban/beets,lengtche/beets,xsteadfastx/beets,tima/beets,YetAnotherNerd/beets,diego-plan9/beets,YetAnotherNerd/beets,Dishwishy/beets,tima/beets,PierreRust/beets,xsteadfastx/beets,kareemallen/beets,diego-plan9/beets,bj-yinyan/beets,marcuskrahl/beets,jcoady9/beets,moodboom/beets,sadatay/beets,sampsyo/beets,beetbox/beets,imsparsh/beets,jayme-github/beets,lengtche/beets,Freso/beets,kelvinhammond/beets,Andypsamp/CODfinalJUNIT,shamangeorge/beets,mosesfistos1/beetbox,MyTunesFreeMusic/privacy-policy,jackwilsdon/beets,Andypsamp/CODjunit,Andypsamp/CODjunit,PierreRust/beets