Fix regression and send the accept message again

I removed gsm48_sendmsg(msg) when removing the send_sms from the
_acc method. This is obviously wrong. Fix the regression, spotted
while testing with LaF0rge. This regression was introduced in r120.
tree: 69a6060c83a63decd910172a66e3f85f96c5b0a0
  1. tests/
  2. tools/
  3. AUTHORS
  4. configure.in
  5. COPYING
  6. Makefile.am
  7. README