websocketAddress setting change

[baris]

This was a setting under admin>settings>sockets it has been moved to config.json.

Old name was websocketAddress now its just address under the socket.io object.

Sample config.json

{
  "url":"yourforum.com",
  "socket.io": {
     "address": "", //or url to socket.io server
     "transports": ["websocket", "polling"]
  }
}

Relevant commit: https://github.com/NodeBB/NodeBB/commit/14e46a87a63f5e983a58a73109710027297924f3

The reason is if you put a invalid value here sockets will not connect and since the admin page uses sockets to save settings you can't change it back.