Remove project_creation_level license check

This was removed in dec08f02 but
reintrodced in 980b8292 due to an
incorrectly resolved merge conflict.

ee/app/controllers/ee/admin/application_settings_controller.rb

@@ -10,10 +10,6 @@ module EE
           attrs += EE::ApplicationSettingsHelper.repository_mirror_attributes
         end
 
-        if License.feature_available?(:project_creation_level)
-          attrs << :default_project_creation
-        end
-
         if License.feature_available?(:custom_project_templates)
           attrs << :custom_project_templates_group_id
         end