Declare sendIdentifiedPRotocol so MQTTtoIR finds it (#840)

* Declare sendIdentifiedPRotocol so MQTTtoIR finds it

Avoids this compilation error on Arduino IDE 1.8.13:

```c
ZgatewayIR:258:90: error: 'sendIdentifiedProtocol' was not declared in this scope
         signalSent = sendIdentifiedProtocol(protocol_name, data, hex, valueBITS, valueRPT);
```                                                                                          ^

* Remove trailing spaces

I *think* that was the linter complaint (given it shows no message, and before/after parts in diff are visually identical

main/ZgatewayIR.ino

@@ -179,6 +179,8 @@ void IRtoMQTT() {
   }
 }
 
+bool sendIdentifiedProtocol(const char* protocol_name, SIGNAL_SIZE_UL_ULL data, const char* hex, unsigned int valueBITS, uint16_t valueRPT);
+
 #  ifdef jsonReceiving
 void MQTTtoIR(char* topicOri, JsonObject& IRdata) {
   if (cmpToMainTopic(topicOri, subjectMQTTtoIR)) {