make bs1770gain calculate sample peak instead of true peak
make bs1770gain calculate sample peak instead of true peak

ibmibmibm/beets,mosesfistos1/beetbox,xsteadfastx/beets,sampsyo/beets,sampsyo/beets,Kraymer/beets,MyTunesFreeMusic/privacy-policy,SusannaMaria/beets,SusannaMaria/beets,MyTunesFreeMusic/privacy-policy,Kraymer/beets,jcoady9/beets,SusannaMaria/beets,pkess/beets,jcoady9/beets,pkess/beets,mosesfistos1/beetbox,diego-plan9/beets,artemutin/beets,xsteadfastx/beets,madmouser1/beets,lengtche/beets,diego-plan9/beets,jcoady9/beets,MyTunesFreeMusic/privacy-policy,artemutin/beets,SusannaMaria/beets,mosesfistos1/beetbox,ibmibmibm/beets,sampsyo/beets,lengtche/beets,madmouser1/beets,ibmibmibm/beets,shamangeorge/beets,Kraymer/beets,jackwilsdon/beets,beetbox/beets,jackwilsdon/beets,artemutin/beets,lengtche/beets,jackwilsdon/beets,beetbox/beets,MyTunesFreeMusic/privacy-policy,shamangeorge/beets,shamangeorge/beets,diego-plan9/beets,sampsyo/beets,xsteadfastx/beets,pkess/beets,jackwilsdon/beets,madmouser1/beets,xsteadfastx/beets,mosesfistos1/beetbox,Kraymer/beets,lengtche/beets,beetbox/beets,jcoady9/beets,diego-plan9/beets,madmouser1/beets,ibmibmibm/beets,artemutin/beets,beetbox/beets,pkess/beets,shamangeorge/beets