Merge pull request #367 from meshtastic/remove-portnum

Removing Portnum we didn't actually use

meshtastic/portnums.proto

@@ -84,11 +84,6 @@ enum PortNum {
    */
   AUDIO_APP = 9;
 
-  /*
-   * Payloads for clients with a network connection proxying MQTT pub/sub to the device
-   */
-  MQTT_CLIENT_PROXY_APP = 10;
-
   /*
    * Provides a 'ping' service that replies to any packet it receives.
    * Also serves as a small example module.