mgw: Fix using incorrect IP version in TC_one_crcx_receive_only_rtp

Send the remote address to MGW so it knows which IP version to return
during CRCX ACK. This actually better suits the test, since there's less
point in checking whether we receive something if we never pass the
IP/port to MGW. In any case, the "recvonly" should still tell MGW to
refrain from sending stuff to us, so we are really testing that here.

Change-Id: Id3452cecf7fb281e5e46471f7f53983c08c6bfdf
diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index c6fe15b..47a7690 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -1593,7 +1593,7 @@
 		f_init(ep);
 		flow := valueof(t_RtpFlow(mp_local_ip, mp_remote_ip, 112, "AMR/8000/1"));
 		flow.em.portnr := 10000;
-		f_flow_create(RTPEM[0], ep, call_id, "recvonly", flow, false);
+		f_flow_create(RTPEM[0], ep, call_id, "recvonly", flow, true);
 
 		f_rtpem_mode(RTPEM[0], RTPEM_MODE_TXONLY);
 		f_sleep(1.0);