Fix VetoableComboBoxModel being broken.

Change-Id: I669eeae8d90f46fae3736dcfdf569e19ea84973d
Reviewed-on: http://gerrit.dmdirc.com/3595
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/components/vetoable/VetoableComboBoxModel.java

     public void setSelectedItem(final Object anObject) {
         final Object oldItem = getSelectedItem();
 
-        super.setSelectedItem(anObject);
         if (!fireVetoableSelectionChange(oldItem, anObject)) {
-            super.setSelectedItem(oldItem);
+            super.setSelectedItem(anObject);
         }
     }