css-provider: Fix up the Switch style
css-provider: Fix up the Switch style

As it was with the old style, when the Switch is in the "on" state the
trough should be using the selected background color.

ebassi/gtk,Lyude/gtk-,chergert/gtk,Adamovskiy/gtk,simokivimaki/gtk,grubersjoe/adwaita,Lyude/gtk-,jigpu/gtk,jadahl/gtk,msteinert/gtk,Adamovskiy/gtk,davidgumberg/gtk,jadahl/gtk,davidgumberg/gtk,jessevdk/gtk,simokivimaki/gtk,grubersjoe/adwaita,bratsche/gtk-,chergert/gtk,chergert/gtk,ebassi/gtk,Lyude/gtk-,Lyude/gtk-,Sidnioulz/SandboxGtk,Distrotech/gtk2,jigpu/gtk,alexlarsson/gtk,davidgumberg/gtk,chergert/gtk,jigpu/gtk,alexlarsson/gtk,ebassi/gtk,jadahl/gtk,Distrotech/gtk2,simokivimaki/gtk,bratsche/gtk-,alexlarsson/gtk,davidgumberg/gtk,bratsche/gtk-,davidgumberg/gtk,Distrotech/gtk2,jigpu/gtk,chergert/gtk,simokivimaki/gtk,ahodesuka/gtk,davidgumberg/gtk,jessevdk/gtk,Distrotech/gtk2,Adamovskiy/gtk,ahodesuka/gtk,simokivimaki/gtk,grubersjoe/adwaita,Distrotech/gtk2,jessevdk/gtk,bratsche/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,Adamovskiy/gtk,Lyude/gtk-,jadahl/gtk,davidt/gtk,ahodesuka/gtk,chergert/gtk,Sidnioulz/SandboxGtk,alexlarsson/gtk,bratsche/gtk-,alexlarsson/gtk,davidgumberg/gtk,bratsche/gtk-,msteinert/gtk,ahodesuka/gtk,alexlarsson/gtk,jessevdk/gtk,msteinert/gtk,Distrotech/gtk2,davidgumberg/gtk,grubersjoe/adwaita,Sidnioulz/SandboxGtk,jadahl/gtk,ahodesuka/gtk,chergert/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,msteinert/gtk,jadahl/gtk,davidt/gtk,grubersjoe/adwaita,jigpu/gtk,ahodesuka/gtk,simokivimaki/gtk,jessevdk/gtk,Sidnioulz/SandboxGtk,davidt/gtk,davidt/gtk,Lyude/gtk-,Adamovskiy/gtk,grubersjoe/adwaita,jessevdk/gtk,Lyude/gtk-,jigpu/gtk,davidt/gtk,chergert/gtk,ebassi/gtk,alexlarsson/gtk,ebassi/gtk,jessevdk/gtk,davidt/gtk,ahodesuka/gtk,grubersjoe/adwaita,ahodesuka/gtk,alexlarsson/gtk,jigpu/gtk,jadahl/gtk,Lyude/gtk-,ebassi/gtk,msteinert/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,msteinert/gtk,Adamovskiy/gtk