TF-3758 Fix hard to close mailbox view when email opened on web responsive tablet

Signed-off-by: dab246 <tdvu@linagora.com>

lib/features/mailbox_dashboard/presentation/controller/mailbox_dashboard_controller.dart

@@ -259,6 +259,7 @@ class MailboxDashBoardController extends ReloadableController
   final localFileDraggableAppState = Rxn<DraggableAppState>();
   final isSenderImportantFlagEnabled = RxBool(true);
   final isAppGridDialogDisplayed = RxBool(false);
+  final isDrawerOpened = RxBool(false);
 
   Session? sessionCurrent;
   Map<Role, MailboxId> mapDefaultMailboxIdByRole = {};