Remove html_entity_decode when getting refentry names from the database

Refentry names are taken from xml IDs and stored in the database during indexing. These are then retrieved and used for linking to functions and methods. Do not use html_entity_decode on these names as these IDs should not have entities in them to begin with. This change aligns this function with the function/method linking functions that only do strtolower as well.

phpdotnet/phd/IndexRepository.php

@@ -189,7 +189,7 @@ public function getRefNames(): array {
 
 
     private function SQLiteRefname($context, $index, $id, $sdesc): void {
-        $ref = strtolower(html_entity_decode($sdesc, ENT_QUOTES, 'UTF-8'));
+        $ref = strtolower($sdesc);
         $this->refs[$ref] = $id;
     }