Fixes issue 1321: Prefs dialog is too tall.

git-svn-id: http://svn.dmdirc.com/trunk@4260 00569f92-eb28-0410-84fd-f71c24880f

src/com/dmdirc/ui/swing/dialogs/prefs/SwingPreferencesDialog.java

         getOkButton().addActionListener(this);
         getCancelButton().addActionListener(this);
 
-        setLayout(new MigLayout("fillx, wmin 650, wmax 650"));
+        setLayout(new MigLayout("fillx, wmin 650, wmax 650, hmax 600"));
         add(tabList, "width 150, growy, spany");
         add(mainPanel, "wrap, width 480, grow");
         add(getLeftButton(), "split, right");