Fixes issue 3850

In a similar vein to the addon browser fix, remove some NOOPd methods doesn't
overly impact CPU usage, makes the seperators show.

Change-Id: I046414cd6e1573a82f808015caa77df793aef7bb
Reviewed-on: http://gerrit.dmdirc.com/962
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>

src/com/dmdirc/addons/ui_swing/dialogs/channelsetting/TopicLabel.java

@@ -168,16 +168,6 @@ public class TopicLabel extends JPanel {
         }
     }
 
-    /** {@inheritDoc} */
-    @Override
-    public void invalidate() {
-    }
-
-    /** {@inheritDoc} */
-    @Override
-    public void revalidate() {
-    }
-
     /** {@inheritDoc} */
     @Override
     public void repaint() {