Refactor: mDNS isn't needed if WIFI is disabled.

ampel-firmware/ampel-firmware.h

@@ -20,6 +20,12 @@
 #  ifdef AMPEL_HTTP
 #    include "web_server.h"
 #  endif
+#  if defined(ESP8266)
+     //allows sensor to be seen as SENSOR_ID.local, from the local network. For example : espd03cc5.local
+#    include <ESP8266mDNS.h>
+#  elif defined(ESP32)
+#    include <ESPmDNS.h>
+#  endif
 #endif
 
 #ifdef AMPEL_LORAWAN
@@ -30,12 +36,6 @@
 #include "co2_sensor.h"
 #include "led_effects.h"
 
-#if defined(ESP8266)
-//allows sensor to be seen as SENSOR_ID.local, from the local network. For example : espd03cc5.local
-#  include <ESP8266mDNS.h>
-#elif defined(ESP32)
-#  include <ESPmDNS.h>
-#endif
 
 void keepServicesAlive();
 void checkFlashButton();