Fix incorrect DifficultyBindable binding implementation
Fix incorrect DifficultyBindable binding implementation

peppy/osu,smoogipooo/osu,ppy/osu,UselessToucan/osu,smoogipoo/osu,smoogipoo/osu,UselessToucan/osu,NeoAdonis/osu,UselessToucan/osu,peppy/osu-new,NeoAdonis/osu,smoogipoo/osu,ppy/osu,NeoAdonis/osu,ppy/osu,peppy/osu,peppy/osu