add missing b' to config.yaml files in ui tests
add missing b' to config.yaml files in ui tests

I'd not gotten around to doing this because of other py3 test
issues, but here we go now!

ibmibmibm/beets,beetbox/beets,jackwilsdon/beets,mosesfistos1/beetbox,sampsyo/beets,Kraymer/beets,ibmibmibm/beets,sampsyo/beets,sampsyo/beets,lengtche/beets,artemutin/beets,sampsyo/beets,pkess/beets,SusannaMaria/beets,mosesfistos1/beetbox,xsteadfastx/beets,lengtche/beets,diego-plan9/beets,diego-plan9/beets,MyTunesFreeMusic/privacy-policy,SusannaMaria/beets,beetbox/beets,artemutin/beets,SusannaMaria/beets,beetbox/beets,shamangeorge/beets,mosesfistos1/beetbox,pkess/beets,xsteadfastx/beets,mosesfistos1/beetbox,beetbox/beets,diego-plan9/beets,pkess/beets,pkess/beets,jackwilsdon/beets,lengtche/beets,madmouser1/beets,artemutin/beets,shamangeorge/beets,artemutin/beets,Kraymer/beets,lengtche/beets,madmouser1/beets,Kraymer/beets,madmouser1/beets,xsteadfastx/beets,madmouser1/beets,shamangeorge/beets,jackwilsdon/beets,MyTunesFreeMusic/privacy-policy,ibmibmibm/beets,shamangeorge/beets,xsteadfastx/beets,MyTunesFreeMusic/privacy-policy,Kraymer/beets,jackwilsdon/beets,SusannaMaria/beets,diego-plan9/beets,ibmibmibm/beets,MyTunesFreeMusic/privacy-policy