Revert "Add prompt and HD settings to the Google OAuth2 plugin."

This reverts commit f74d6bb605.

lib/auth/google_oauth2_authenticator.rb

@@ -59,9 +59,7 @@ class Auth::GoogleOAuth2Authenticator < Auth::Authenticator
               strategy.options[:client_id] = SiteSetting.google_oauth2_client_id
               strategy.options[:client_secret] = SiteSetting.google_oauth2_client_secret
            },
-           skip_jwt: true,
-           prompt: SiteSetting.google_oauth2_prompt,
-           hd: SiteSetting.google_oauth2_hd
+           skip_jwt: true
   end
 
   protected