Merge pull request #859 from mcspr/hass-no-device-class

Don't send device_class for Home Assistant sensor

code/espurna/homeassistant.ino

@@ -24,7 +24,6 @@ void _haSendMagnitude(unsigned char i, JsonObject& config) {
     unsigned char type = magnitudeType(i);
     config["name"] = getSetting("hostname") + String(" ") + magnitudeTopic(type);
     config.set("platform", "mqtt");
-    config.set("device_class", "sensor");
     config["state_topic"] = mqttTopic(magnitudeTopicIndex(i).c_str(), false);
     config["unit_of_measurement"] = magnitudeUnits(type);