Fix UART_MQTT_SUPPORT guards

code/espurna/espurna.ino

@@ -147,7 +147,7 @@ void setup() {
     #if SCHEDULER_SUPPORT
         schSetup();
     #endif
-    #ifdef UART_MQTT_SUPPORT
+    #if UART_MQTT_SUPPORT
         uartmqttSetup();
     #endif
 

code/espurna/uartmqtt.ino

@@ -7,7 +7,7 @@ Adapted by Xose Pérez <xose dot perez at gmail dot com>
 
 */
 
-#ifdef UART_MQTT_SUPPORT
+#if UART_MQTT_SUPPORT
 
 char _uartmqttBuffer[UART_MQTT_BUFFER_SIZE];
 bool _uartmqttNewData = false;
@@ -100,4 +100,4 @@ void uartmqttSetup() {
 
 }
 
-#endif
+#endif // UART_MQTT_SUPPORT