Fix use of obsolete NUnit attribute
Fix use of obsolete NUnit attribute

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