fix(vd960DBN): add missing closing brace for case PUBLISH block in iot_process_recv

case PUBLISH: { ... } was missing its closing }, causing ARMCC to think
iot_send_heartbeat and iot_connect_broker were declared inside a function body.

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c

@@ -348,6 +348,7 @@ static void iot_process_recv(void) {
                     }
                 }
                 break;
+            }
 
             case PINGRESP:
                 PRINT("IOT: ← PINGRESP\n");