Merge branch '3521-fix-projects-helper' into 'master'

Fix NoMethodErrors caused by incorrect module loading

Closes #3521

See merge request gitlab-org/gitlab-ee!3062

app/helpers/projects_helper.rb

 module ProjectsHelper
   include Gitlab::CurrentSettings
 
+  prepend ::EE::ProjectsHelper
+
   def link_to_project(project)
     link_to [project.namespace.becomes(Namespace), project], title: h(project.name) do
       title = content_tag(:span, project.name, class: 'project-name')

ee/app/helpers/ee/gitlab_routing_helper.rb

 module EE
   module GitlabRoutingHelper
-    include ProjectsHelper
-    include ApplicationSettingsHelper
+    include ::ProjectsHelper
+    include ::ApplicationSettingsHelper
 
     def geo_primary_web_url(project)
       File.join(::Gitlab::Geo.primary_node.url, ::Gitlab::Routing.url_helpers.project_path(project))