Device: fix missing initializer warnign

Author: pennam

src/ArduinoIoTCloudDevice.cpp

@@ -110,7 +110,7 @@ ArduinoCloudDevice::State ArduinoCloudDevice::handleSendCapabilities() {
   deliver(reinterpret_cast<Message*>(&deviceBegin));
 
   /* Subscribe to device topic to request */
-  ThingBeginCmd thingBegin = { ThingBeginCmdId };
+  ThingBeginCmd thingBegin = { ThingBeginCmdId, {} };
   deliver(reinterpret_cast<Message*>(&thingBegin));
 
   /* No device configuration received. Wait: 4s -> 8s -> 16s -> 32s -> 32s ...*/