Input: atkbd - fix complaints about 'releasing unknown key 0x7f'

Fix bat_xl and err_xl logic causing atkbd to complain about 'unknown
key 0x7f'. Noted by Ben LaHaise.

Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>