Aphlict - remove listeners when clients close the connection

Summary: Ref T7110. Listeners are now removed when clients close the connection to avoid stacking a never ending number of unused listeners.

Test Plan: Using `wscat` to connect to the Aphlict server; when closing the connection a 'Diconnected.' will appear in the logs and the number of active listeners is decreased by one.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T7110

Differential Revision: https://secure.phabricator.com/D11634

Author: pierremoreau

support/aphlict/server/lib/AphlictClientServer.js

@@ -69,6 +69,11 @@ JX.install('AphlictClientServer', {
           }
         });
 
+        ws.on('close', function() {
+          self.getListenerList().removeListener(listener);
+          log('Disconnected.');
+        });
+
         wss.on('close', function() {
           self.getListenerList().removeListener(listener);
           log('Disconnected.');