Fixed authentication bar disapearing. Changed build version to 19 for android, 4.0.8 (2) for iOS.

lib/src/screens/auth/auth_page.dart

@@ -39,10 +39,10 @@ class AuthPageState extends State<AuthPage> {
     _reaction ??=
         reaction((_) => widget.authViewModel.state, (ExecutionState state) {
       if (state is ExecutedSuccessfullyState) {
+        _authBar?.dismiss();
         if (widget.onAuthenticationFinished != null) {
           widget.onAuthenticationFinished(true, this);
         } else {
-          _authBar?.dismiss();
           showBar<void>(context, S.of(context).authenticated);
         }
       }