Fixed bug in DOM ID generation.

- We need to base DOM IDs on the FULL, UNIQUE identifier, not just the search class; otherwise, multiple filtered views of the same search backend will yield duplicate IDs.

module/VuFind/src/VuFind/Controller/CombinedController.php

@@ -166,7 +166,7 @@ class CombinedController extends AbstractSearch
             // Calculate a unique DOM id for this section of the search results;
             // $searchClassId may contain colons, which must be converted.
             $combinedResults[$current]['domId']
-                = 'combined_' . str_replace(':', '____', $searchClassId);
+                = 'combined_' . str_replace(':', '____', $current);
 
             $combinedResults[$current]['view']
                 = (!isset($settings['ajax']) || !$settings['ajax'])