GtkMenuButton: Use view-context-menu-symbolic when direction is NONE
GtkMenuButton: Use view-context-menu-symbolic when direction is NONE

This makes it easier to construct gear menus: just set the direction
to 'none', no need to manually construct an image.

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