Remove unnecessary null coalescing operator

Co-authored-by: thorsten <45284+thorsten@users.noreply.github.com>

Author: Copilot

phpmyfaq/admin/category.add.php

@@ -86,7 +86,7 @@
 
             // Validate that the category was found
             if ($parentCategoryData->getId() > 0) {
-                $parentCategoryLang = $parentCategoryData->getLang() ?? $faqConfig->getLanguage()->getLanguage();
+                $parentCategoryLang = $parentCategoryData->getLang();
                 $parentCategoryName = $parentCategoryData->getName();
             } else {
                 // Parent category doesn't exist in database - use fallback values