stylecontext: Use right invalidation func
stylecontext: Use right invalidation func

gtk_style_context_invalidate_internal() will respect only the current
saved state of the style context, which is wrong when updating the scale.
In that case, the whole style context needs updating.

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