cbc: Fix f_sbcap_tx_write_replace_warn_resp()

The line was wrongly removed when pushing a new version of the patch for
review submission.

Fixes: 7c13cb7e0f
Change-Id: If99ff5b83e8f0c577e60e0406b001a3753213deb

cbc/CBC_Tests.ttcn

@@ -315,6 +315,8 @@ private function f_sbcap_tx_write_replace_warn_resp(CBS_Message msg, integer idx
 runs on test_CT {
 	var template (value) SBC_AP_PDU tx;
 	/* TODO: pass Unknown Tracking Area List as parameter above (omit by default) */
+	tx := ts_SBCAP_WRITE_WARNING_RESP(int2bit(msg.msg_id, 16),
+					  int2bit(msg.ser_nr, 16));
 	f_SBC_AP_send(tx, idx);
 }