Auth0: Error during authorization is ignored for blocked users

After blocking a user through the Auth0 dashboard, when I try to login as the blocked user, no errors are logged and I am redirected back to the login form. The redirect address from Auth0 is `${NUXT_OAUTH_AUTH0_REDIRECT_URL}?error=unauthorized&error_description=user%20is%20blocked`, so an error can be created and passed to the `onError` callback.

I will provide a pull request for this issue.

