Fix the emacs modeline indentation variables

mail/base/content/messageWindow.js

@@ -1,4 +1,4 @@
-# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+# -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 # The contents of this file are subject to the Netscape Public
 # License Version 1.1 (the "License"); you may not use this file
 # except in compliance with the License. You may obtain a copy of