render: Make image effect not depend on state
render: Make image effect not depend on state

Instead rely on -gtk-image-effect only. Adwaita should already work this
way.

Relying on state was a leftover feature from the GTK 2 days.

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