[NbtkIconView] Remove row directly based on it's position
[NbtkIconView] Remove row directly based on it's position

Rather than refreshing the whole model when a row is removed instead find the
corresponding actor and remove that.

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