fix: improve MQTT/web memory usage and streamline broker controls

variants/eastmesh_mqtt/platformio.ini

@@ -8,7 +8,7 @@ build_flags =
   -D ADMIN_PASSWORD='"password"'
   -D MAX_NEIGHBOURS=50
   -D WITH_MQTT_UPLINK=1
-  ;  -D MQTT_DEBUG=1
+  -D MQTT_DEBUG=1
   -D WIFI_SSID='"myssid"'
   -D WIFI_PWD='"mypwd"'
   -D MQTT_DEFAULT_IATA='"MEL"'