NbtkButton: Remove style changed chain up as we override completely
NbtkButton: Remove style changed chain up as we override completely

jonnylamb/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,pwithnall/mx,pwithnall/mx,pwithnall/mx,jonnylamb/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx