Aphlict - fix incrementation of _messagesIn

Summary: Ref T7124. The local version of `this` in the handler of 'end' was incremented rather than the global one.

Test Plan: Sending test notifications did not increment the `messages.in` value before this patch even if it should have. With the patch sending test notifications does increment `messages.in`.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7124

Differential Revision: https://secure.phabricator.com/D11648

Author: pierremoreau

support/aphlict/server/lib/AphlictAdminServer.js

@@ -55,7 +55,7 @@ JX.install('AphlictAdminServer', {
 
               self.getLogger().log(
                 'Received notification: ' + JSON.stringify(msg));
-              ++this._messagesIn;
+              ++self._messagesIn;
 
               try {
                 self._transmit(msg);