Tidy up BackButton and adjust transitions a bit.
Tidy up BackButton and adjust transitions a bit.

johnneijzen/osu,peppy/osu-new,theguii/osu,smoogipoo/osu,2yangk23/osu,nyaamara/osu,EVAST9919/osu,DrabWeb/osu,naoey/osu,Damnae/osu,Frontear/osuKyzer,smoogipoo/osu,UselessToucan/osu,default0/osu,smoogipoo/osu,RedNesto/osu,DrabWeb/osu,naoey/osu,ppy/osu,EVAST9919/osu,2yangk23/osu,smoogipooo/osu,ppy/osu,ppy/osu,peppy/osu,naoey/osu,peppy/osu,UselessToucan/osu,DrabWeb/osu,osu-RP/osu-RP,peppy/osu,NeoAdonis/osu,UselessToucan/osu,johnneijzen/osu,NeoAdonis/osu,ZLima12/osu,NotKyon/lolisu,ZLima12/osu,NeoAdonis/osu,tacchinotacchi/osu,Nabile-Rahmani/osu,Drezi126/osu