window: Fix flipping orientation when horizontal
window: Fix flipping orientation when horizontal

Fix the transition animation when the orientation is horizontal and you
flip the value of the orientation-reversed property.

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