removed redundant request spec

spec/requests/user_groups_spec.rb

-require 'rails_helper'
-
-RSpec.describe "UserGroups", type: :request do
-  describe "GET /user_groups" do
-    it "works! (now write some real specs)" do
-      get user_groups_path
-      expect(response).to have_http_status(200)
-    end
-  end
-end