Refacto : on ne verifie plus le role admin mais les permissions du role

em2rp/lib/views/calendar_page.dart

@@ -57,7 +57,7 @@ class _CalendarPageState extends State<CalendarPage> {
   Widget build(BuildContext context) {
     final eventProvider = Provider.of<EventProvider>(context);
     final localUserProvider = Provider.of<LocalUserProvider>(context);
-    final isAdmin = localUserProvider.role == 'ADMIN';
+    final isAdmin = localUserProvider.hasPermission('view_all_users');
     final isMobile = MediaQuery.of(context).size.width < 600;
 
     if (eventProvider.isLoading) {