media: lirc: drop trailing space from scancode transmit

When transmitting, infrared drivers expect an odd number of samples; iow
without a trailing space. No problems have been observed so far, so
this is just belt and braces.

Fixes: 9b619258

 ("media: lirc: implement scancode sending")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>