Update Startup.Auth.cs

I think this area should be commented out SocialLogins aren't setup since START-HERE doensn't describe the steps yet. 
Leaving this uncommented results in an Error about ClienId option that should be provided.
ConfigurationManager?? where can someone set an appsetting linke EnableSocialLogins???
Anyway this helps...
Merge branch 'MauRiEEZZZ-master'