Fix SAML SSO redirects for pseudonymized URLS

The Group SSO Controller is skipping the :group method before it executes.
The URL-pseudonymization code that gets included on every page is checking if group is defined.
By calling group for tracking the pseudonymized URL,
it caused an endless redirect.

Changelog: fixed

ee/app/controllers/groups/sso_controller.rb

@@ -75,6 +75,10 @@ class Groups::SsoController < Groups::ApplicationController
 
   private
 
+  def group
+    @group ||= unauthenticated_group
+  end
+
   def new_user
     @new_user ||= User.new(new_user_params)
   end

ee/spec/features/groups/sso_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe 'Group SAML SSO', :js do
+RSpec.describe 'Group SAML SSO', :js, :snowplow do
   include CookieHelper
 
   let(:user) { create(:user) }