fix: corrected validation

Author: thorsten

phpmyfaq/attachment.php

@@ -112,7 +112,7 @@
 
 if (
     $attachment && $attachment->getRecordId() > 0 && ($faqConfig->get('records.allowDownloadsForGuests') ||
-        (($groupPermission || ($groupPermission && $userPermission)) && isset($permission['dlattachment'])))
+        (($groupPermission || $userPermission) && isset($permission['dlattachment']) && $permission['dlattachment'] === true))
 ) {
     $response = new StreamedResponse(function () use ($attachment) {
         $attachment->rawOut();