Save the config if the user closes the main frame rather than using /quit

git-svn-id: http://svn.dmdirc.com/trunk@225 00569f92-eb28-0410-84fd-f71c24880f

src/uk/org/ownage/dmdirc/ui/MainFrame.java

@@ -175,6 +175,7 @@ public class MainFrame extends javax.swing.JFrame implements WindowListener {
     
     public void windowClosing(WindowEvent windowEvent) {
         ServerManager.getServerManager().closeAll(Config.getOption("general","closemessage"));
+        Config.save();
     }
     
     public void windowClosed(WindowEvent windowEvent) {