Fix typo in LoginUser for authentication-with-email-and-apollo example.

[dansteren]

For authentication-with-email-and-apollo example

Problem:
When navigating to http://localhost:3000/login the following message is displayed.

  11 | }
  12 | 
  13 | render () {
> 14 |   if (this.props.data.loading) {
  15 | 
  16 |     return (
  17 |       <div className='w-100 pa4 flex justify-center'>

Solution
The CreateLogin component uses a named graphql query, so the response is passed to props with that name (loggedInUserQuery) instead of data. This PR replaces this.props.data with this.props.loggedInUserQuery.

[lionstone]

Why is this not merged? Had the same error