evdev: Update xkb state after input is resumed

xkb_state creation has been refactored out of clutter_evdev_set_keyboard_map(),
and used too in clutter_evdev_reclaim_devices(), so the xkb_state is fresh
clean after input is paused/resumed (and keyboard state possibly changed in
between)

https://bugzilla.gnome.org/show_bug.cgi?id=733562