scrolledwindow: Fix overshoot coordinates
scrolledwindow: Fix overshoot coordinates

With gtk_gesture_get_point() returning events in
gtk_event_controller_get_widget() coordinates, we no longer need
to compensate for the overshoot here.

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