Fix HR mod affecting original beatmap difficulty
Fix HR mod affecting original beatmap difficulty

Fixes #2575.

naoey/osu,naoey/osu,johnneijzen/osu,johnneijzen/osu,smoogipoo/osu,smoogipoo/osu,ZLima12/osu,NeoAdonis/osu,EVAST9919/osu,ppy/osu,smoogipoo/osu,NeoAdonis/osu,peppy/osu,UselessToucan/osu,2yangk23/osu,ppy/osu,UselessToucan/osu,ZLima12/osu,DrabWeb/osu,peppy/osu-new,peppy/osu,EVAST9919/osu,NeoAdonis/osu,UselessToucan/osu,ppy/osu,peppy/osu,DrabWeb/osu,naoey/osu,2yangk23/osu,DrabWeb/osu,smoogipooo/osu