gesture: Fix wrong assert in gtk_gesture_set_window
gesture: Fix wrong assert in gtk_gesture_set_window

The window must be part of the event controller widget, so
fix the inverted logic.

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