fix how to create a google app

https://wordpress.org/support/topic/request-failed-either-you-have-cancelled-the-authentication-or-google-refused-t?replies=11#post-6088092

git-svn-id: https://plugins.svn.wordpress.org/wordpress-social-login/trunk@1002724 b8457f37-d9ea-0310-8a92-e5e31aec5664