Do not modify associated device for non-master devices on dispose
Only master devices must modify the associated device to separate a pointer/keyboard pair, slave devices must only call _gdk_device_remove_slave(). Fixes bug 639767 - password not accepted in gnome-screensaver dialog, reported by Frederic Crozat. On VT-switch, the X server removes its grab on HW devices, the effect on clients is that slave devices disappear, and these were mistakenly mangling the master device hierarchy. so gdk_device_get_associated_device() on the client pointer wouldn't return the paired keyboard anymore. The final effect is that gtkplug-x11 wasn't setting a keyboard to its generated events.
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