disable uniqueness option in lightbox

This also causes the duplicates not to be opened in the lightbox at all.

Author: splitbrain

script.js

@@ -67,6 +67,7 @@ jQuery(function () {
         captionHTML: true, // we allow HTML and double escape in the formatter
         alertError: false,
         fileExt: false,
+        uniqueImages: false
     });
 });