topos: fix incorrect contact in 183 and 200 OK responces

When using topos, Kamailio does not set correct contact in 183 progres and 200 OK.
But for INVITE and Bye contacts are correct.

This modification seems fix it.

src/modules/topos/tps_msg.c

@@ -1016,7 +1016,7 @@ int tps_response_sent(sip_msg_t *msg)
 	tps_remove_headers(msg, HDR_RECORDROUTE_T);
 	tps_remove_headers(msg, HDR_CONTACT_T);
 
-	if(direction==TPS_DIR_UPSTREAM) {
+	if(direction==TPS_DIR_DOWNSTREAM) {
 		tps_reinsert_contact(msg, &stsd, &stsd.as_contact);
 	} else {
 		tps_reinsert_contact(msg, &stsd, &stsd.bs_contact);