window: call gtk_widget_unmap() on popover widgets unconditionally
window: call gtk_widget_unmap() on popover widgets unconditionally

is_visible() wasn't the right check to perform here before unmapping,
and gtk_widget_unmap() already avoids being doubly called by checking
gtk_widget_get_mapped() anyway.

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