MSC_ConnectionHandler: do not allow as_Media_mgw to exit

The altstep as_handover needs to repeat until the IPACC and the MGCP rtp
negotiation is done (MDCX). By setting the norepeat flag of the sub
altsteap as_Media_mgw to true, we allow as_handover to exit early, even
when the handover is not done yet, which eventually causes the testcase
to fail.

Change-Id: I303879a9153d25a02743dc1d4713ae74918b9be7
fixes: OS#4752
diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 76a56fc..c372709 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -1269,7 +1269,7 @@
 		}
 		}
 	[st.rr_ho_cmpl_seen] as_Media_ipacc();
-	[st.rr_ho_cmpl_seen] as_Media_mgw(true);
+	[st.rr_ho_cmpl_seen] as_Media_mgw();
 	[st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_DEACT_SACCH(st.old_chan_nr)) {
 		repeat;
 		}