Restore MAVLink network behaviour with fixed remote system approach

src/modules/mavlink/mavlink_main.cpp

@@ -1049,10 +1049,10 @@ Mavlink::init_udp()
 	/* set default target address, but not for onboard mode (will be set on first received packet) */
 	memset((char *)&_src_addr, 0, sizeof(_src_addr));
 	if (_mode != MAVLINK_MODE_ONBOARD) {
-		set_client_source_initialized();
 		_src_addr.sin_family = AF_INET;
 		inet_aton("127.0.0.1", &_src_addr.sin_addr);
 		_src_addr.sin_port = htons(DEFAULT_REMOTE_PORT_UDP);
+		set_client_source_initialized();
 	}
 
 	/* default broadcast address */