Execute cancel action when pressing escape and closing authentication window.

src/net/java/sip/communicator/util/swing/AuthenticationWindow.java

@@ -346,7 +346,7 @@ private void enableKeyActions()
         {
             public void actionPerformed(ActionEvent e)
             {
-                AuthenticationWindow.this.setVisible(false);
+                close(true);
             }
         };