GtkTooltip: Drop an unused variable
GtkTooltip: Drop an unused variable

The toplevel_window was never set, and the only place where it
was used was causing us to hide tooltips needlessly. So removing
it is a double win.

https://bugzilla.gnome.org/show_bug.cgi?id=733321

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