Change default OsuHitObject combo colour to gray
Change default OsuHitObject combo colour to gray

This makes it easier to see additive elements in testcases.

UselessToucan/osu,NeoAdonis/osu,RedNesto/osu,NeoAdonis/osu,peppy/osu,peppy/osu-new,smoogipoo/osu,smoogipooo/osu,osu-RP/osu-RP,DrabWeb/osu,ppy/osu,Nabile-Rahmani/osu,ZLima12/osu,smoogipoo/osu,2yangk23/osu,peppy/osu,EVAST9919/osu,UselessToucan/osu,naoey/osu,ZLima12/osu,2yangk23/osu,DrabWeb/osu,peppy/osu,nyaamara/osu,naoey/osu,NeoAdonis/osu,ppy/osu,naoey/osu,ppy/osu,johnneijzen/osu,Drezi126/osu,Frontear/osuKyzer,EVAST9919/osu,johnneijzen/osu,tacchinotacchi/osu,DrabWeb/osu,UselessToucan/osu,Damnae/osu,smoogipoo/osu