Use an icon to indicate whether service template is active

Former-commit-id: 41715fbc

app/views/admin/services/index.html.haml

@@ -13,7 +13,7 @@
     - @services.sort_by(&:title).each do |service|
       %tr
         %td
-          = icon("copy", class: 'clgray')
+          = boolean_to_icon service.activated?
         %td
           = link_to edit_admin_application_settings_service_path(service.id) do
             %strong= service.title