SpiceDisplay: Don't try to scale mouse coordinates when we're not scaling
SpiceDisplay: Don't try to scale mouse coordinates when we're not scaling

Often (when not resized by the user) even though scaling is enabled, we are
not actually scaling. In this case it is not necessary to scale the
mouse coordinates, and sometimes it is even harmful.

Signed-off-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>

freedesktop-unofficial-mirror/spice__spice-gtk,fgouget/spice-gtk,mathslinux/spice-gtk,elmarco/spice-gtk,dezelin/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,flexVDI/spice-gtk,mathslinux/spice-gtk,dezelin/spice-gtk,fgouget/spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,elmarco/spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,SPICE/spice-gtk,Fantu/spice-gtk,dezelin/spice-gtk,Fantu/spice-gtk,SPICE/spice-gtk,guodong/spice-gtk,guodong/spice-gtk,mathslinux/spice-gtk,elmarco/spice-gtk,flexVDI/spice-gtk,elmarco/spice-gtk,dezelin/spice-gtk,Fantu/spice-gtk,fgouget/spice-gtk,mathslinux/spice-gtk,Fantu/spice-gtk,guodong/spice-gtk