cssnodedeclaration: Fix src/dest swap in memmove()
cssnodedeclaration: Fix src/dest swap in memmove()

The main cause here were the wrong style classes being removed, such as
"message-dialog" instead of "csd" for GtkMessageDialog.

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