The G303 is a wired device and we need to talk to it with 0xff (OK a
#define would be good). This was not a problem for all of the unifying
devices given that the kernel overwrites the device_id for us, but the
corded devices are a different kind, and this one rejects device id != ff.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>