Add client.loop_forever() for auto-reconnect

Even though hc2mqtt was running, and showed active log lines, I stopped receiving the messages sometimes in the MQTT server and subscribed processes.
Adding client.loop_forever() will auto-reconnect to the mqtt server in case of network loss / hickups. Seems to help for my setup.
Docs: https://pypi.org/project/paho-mqtt/#network-loop

hc2mqtt

@@ -31,6 +31,7 @@ def hc2mqtt(config_file: str, mqtt_host: str, mqtt_prefix: str):
 		thread = Thread(target=client_connect, args=(client, device, mqtt_topic))
 		thread.start()
 
+	client.loop_forever()
 
 
 # Map their value names to easier state names