gtkwindow: Clean up gtk_window_move_resize a bit more
gtkwindow: Clean up gtk_window_move_resize a bit more

Don't shadow existing variables. Instead of sharing the allocation and
then overwriting the width/height when convenient, declare it in the
block we use it in, as, really, the three different paths are all
extremely different, and there's no sense in sharing the variable.

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