Updated user delete wiki spec

spec/features/projects/wiki/user_deletes_wiki_page_spec.rb

 require 'spec_helper'
 
-feature 'User deletes wiki page' do
+feature 'User deletes wiki page', :js do
   let(:user) { create(:user) }
   let(:project) { create(:project, namespace: user.namespace) }
   let(:wiki_page) { create(:wiki_page, wiki: project.wiki) }
@@ -13,6 +13,7 @@ feature 'User deletes wiki page' do
   it 'deletes a page' do
     click_on('Edit')
     click_on('Delete')
+    find('.js-modal-primary-action').click
     
     expect(page).to have_content('Page was successfully deleted')
   end