Reply to wildcard ep in CRCX with a concrete endpoint

BSC_ConnectionHandler.ttcn:563 This helps TC_gsup_cancel which
previously encountered a Dynamic test case error: Using the value of an
optional field containing omit. The test still fails, but this time
because it "Received unexpected BSSAP instead of CM SERV REJ".

Change-Id: I9fedf2573487066b951804a328ba428d2189c4a4

msc/MSC_Tests.ttcn

@@ -1504,6 +1504,7 @@ private function f_tc_gsup_cancel(charstring id, BSC_ConnHdlrPars pars) runs on
 	cpars.bss_rtp_port := 1110;
 	cpars.mgcp_connection_id_bss := '22222'H;
 	cpars.mgcp_connection_id_mss := '33333'H;
+	cpars.mgcp_ep := "rtpbridge/1@mgw";
 
 	/* Location Update to make subscriber known */
 	f_perform_lu();