csd: Fix non-resizable windows
csd: Fix non-resizable windows

For csd override-redirect windows, we don't set up resize handles,
but we were not ignoring the margin in all places, causing some
size calculations to go wrong.

jessevdk/gtk,ahodesuka/gtk,Lyude/gtk-,alexlarsson/gtk,Lyude/gtk-,Lyude/gtk-,alexlarsson/gtk,davidgumberg/gtk,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,davidgumberg/gtk,jigpu/gtk,davidgumberg/gtk,Lyude/gtk-,jadahl/gtk,Lyude/gtk-,jigpu/gtk,jessevdk/gtk,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,ahodesuka/gtk,jigpu/gtk,Adamovskiy/gtk,ahodesuka/gtk,jadahl/gtk,chergert/gtk,chergert/gtk,chergert/gtk,Lyude/gtk-,alexlarsson/gtk,chergert/gtk,Adamovskiy/gtk,jigpu/gtk,jigpu/gtk,Adamovskiy/gtk,chergert/gtk,grubersjoe/adwaita,ahodesuka/gtk,davidgumberg/gtk,jadahl/gtk,alexlarsson/gtk,alexlarsson/gtk,jigpu/gtk,jessevdk/gtk,jessevdk/gtk,chergert/gtk,Lyude/gtk-,jadahl/gtk,Adamovskiy/gtk,davidgumberg/gtk,Lyude/gtk-,ahodesuka/gtk,jadahl/gtk,alexlarsson/gtk,jadahl/gtk,jigpu/gtk,jessevdk/gtk,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,davidgumberg/gtk,davidgumberg/gtk,ahodesuka/gtk,jessevdk/gtk,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,Adamovskiy/gtk,chergert/gtk,alexlarsson/gtk,grubersjoe/adwaita,Adamovskiy/gtk,chergert/gtk,grubersjoe/adwaita,jessevdk/gtk,davidgumberg/gtk,jigpu/gtk