Fix backgrounds being scaled stupidly

Change-Id: I7342ae2f0efcd1049b5cb3cd9d719f6a7e8f6745
Reviewed-on: http://gerrit.dmdirc.com/662
Automatic-Compile: Gregory Holmes <greg@dmdirc.com>
Reviewed-by: Gregory Holmes <greg@dmdirc.com>

src/com/dmdirc/addons/ui_swing/UIUtilities.java

         final int x = (bounds.width / 2) - (backgroundImage.getWidth(null) / 2);
         final int y = (bounds.height / 2) - (backgroundImage.getHeight(null) / 2);
         g.drawImage(backgroundImage, x, y, backgroundImage.getWidth(null),
-                backgroundImage.getWidth(null), null);
+                backgroundImage.getHeight(null), null);
     }
 
     private static void paintStretchedAspectRatioBackground(final Graphics2D g,