Remove the translation for 'by_clientid'

priv/emq.schema

@@ -722,7 +722,6 @@ end}.
 
 {translation, "emqttd.pubsub", fun(Conf) ->
   [{pool_size, cuttlefish:conf_get("mqtt.pubsub.pool_size", Conf)},
-   {by_clientid, cuttlefish:conf_get("mqtt.pubsub.by_clientid", Conf)},
    {async, cuttlefish:conf_get("mqtt.pubsub.async", Conf)}]
 end}.