Adjustment#promotion? just checks source_type
Adjustment#promotion? just checks source_type

Change this to be simpler just to match the .promotion scope.

bonobos/solidus,jsurdilla/solidus,jordan-brough/solidus,devilcoders/solidus,lsirivong/solidus,richardnuno/solidus,xuewenfei/solidus,Senjai/solidus,athal7/solidus,richardnuno/solidus,pervino/solidus,athal7/solidus,forkata/solidus,scottcrawford03/solidus,jordan-brough/solidus,pervino/solidus,Arpsara/solidus,grzlus/solidus,jsurdilla/solidus,grzlus/solidus,devilcoders/solidus,forkata/solidus,Arpsara/solidus,Senjai/solidus,xuewenfei/solidus,scottcrawford03/solidus,pervino/solidus,xuewenfei/solidus,devilcoders/solidus,grzlus/solidus,Senjai/solidus,Arpsara/solidus,lsirivong/solidus,bonobos/solidus,athal7/solidus,jsurdilla/solidus,forkata/solidus,ckk-scratch/solidus,ckk-scratch/solidus,devilcoders/solidus,xuewenfei/solidus,jordan-brough/solidus,scottcrawford03/solidus,ckk-scratch/solidus,lsirivong/solidus,forkata/solidus,pervino/solidus,Arpsara/solidus,richardnuno/solidus,jordan-brough/solidus,grzlus/solidus,richardnuno/solidus,scottcrawford03/solidus,lsirivong/solidus,ckk-scratch/solidus,bonobos/solidus,jsurdilla/solidus,Senjai/solidus,bonobos/solidus,athal7/solidus