xi2: Reset the correct scroll axes on DeviceChanged
xi2: Reset the correct scroll axes on DeviceChanged

Otherwise, we'll have incorrect scrolling when we switch hardware
devices without switching virtual devices. For example, on a ThinkPad,
scroll using the touchpad, move the eraser mouse, and then scroll again:
the deltas will be wrong. This also matches what GTK+ does.

https://bugzilla.gnome.org/show_bug.cgi?id=689258

djdeath/clutter-android,Distrotech/clutter,djdeath/clutter-android,GNOME/clutter,heysion/clutter-clone,djdeath/clutter,djdeath/clutter,collects/clutter,jigpu/clutter,heysion/clutter-clone,ebassi/clutter,Distrotech/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,jigpu/clutter,heysion/clutter-clone,GNOME/clutter,collects/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter,djdeath/clutter,ebassi/clutter,djdeath/clutter,djdeath/clutter-android,GNOME/clutter,heysion/clutter-clone,Distrotech/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,collects/clutter,jigpu/clutter,ebassi/clutter,djdeath/clutter-android,djdeath/clutter-android,heysion/clutter-clone,collects/clutter,GNOME/clutter,collects/clutter,djdeath/clutter,ebassi/clutter