refactor(content_management): remove unnecessary dispose method

Author: fulleni

lib/content_management/view/headlines_page.dart

@@ -31,11 +31,6 @@ class _HeadlinesPageState extends State<HeadlinesPage> {
     );
   }
 
-  @override
-  void dispose() {
-    super.dispose();
-  }
-
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizationsX(context).l10n;