mir: fix toggling between maximized and restored
mir: fix toggling between maximized and restored

jigpu/gtk,jigpu/gtk,chergert/gtk,chergert/gtk,grubersjoe/adwaita,chergert/gtk,jadahl/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,davidgumberg/gtk,alexlarsson/gtk,grubersjoe/adwaita,davidgumberg/gtk,jadahl/gtk,Adamovskiy/gtk,davidgumberg/gtk,jigpu/gtk,jadahl/gtk,chergert/gtk,jigpu/gtk,jadahl/gtk,davidgumberg/gtk,davidgumberg/gtk,grubersjoe/adwaita,davidgumberg/gtk,alexlarsson/gtk,grubersjoe/adwaita,jadahl/gtk,jadahl/gtk,chergert/gtk,alexlarsson/gtk,chergert/gtk,davidgumberg/gtk,Adamovskiy/gtk,jadahl/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,grubersjoe/adwaita,Adamovskiy/gtk,chergert/gtk,Adamovskiy/gtk,Adamovskiy/gtk,alexlarsson/gtk,Adamovskiy/gtk,grubersjoe/adwaita,Adamovskiy/gtk,alexlarsson/gtk,chergert/gtk,jigpu/gtk,alexlarsson/gtk,alexlarsson/gtk,jigpu/gtk,grubersjoe/adwaita,Adamovskiy/gtk