[media] imon: remove redundant change_protocol call

There was a redundant call to imon_ir_change_protocol -- its already
getting called from ir_input_register. Also do some minor housekeeping
with var names and formatting.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>