mgcp: Test the second CRCX as a CRCX and not as a re-transmission

The second CRCX would be mostly ignored and be handled by the
retransmission layer of MGCP.
diff --git a/openbsc/tests/mgcp/mgcp_test.ok b/openbsc/tests/mgcp/mgcp_test.ok
index 1143a04..5f300e4 100644
--- a/openbsc/tests/mgcp/mgcp_test.ok
+++ b/openbsc/tests/mgcp/mgcp_test.ok
@@ -1,6 +1,7 @@
 Testing AUEP1
 Testing AUEP2
 Testing CRCX
+Testing DLCX
 Testing CRCX_ZYN
 Testing EMPTY
 Testing SHORT1