fix: Don't allow homeassistant.discovery_topic
to be equal to mqtt.base_topic
https://github.com/Koenkk/zigbee2mqtt/issues/23109
#23209
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This PR adds a check to check wether the
homeassistant.discovery_topic
andmqtt.base_topic
are not equal (and refuses to start when they are). This is not allowed since Zigbee2MQTT unsubscribes from this topic and thus makes devices uncontrollable.Fixes #23109