HID: wacom: bluetooth: send exit report for recent Bluetooth devices

commit 619d3a2922ce623ca2eca443cc936810d328317c upstream.

The code path for recent Bluetooth devices omits an exit report which
resets all the values of the device.

Fixes: 4922cd26 ("HID: wacom: Support 2nd-gen Intuos Pro's Bluetooth classic interface")
Cc: <stable@vger.kernel.org> # 4.11
Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>