Load custom configuration as documented

Let's see if the approach set out in the Rails documentation works now
that we have refactored related tests.

config/application.rb

@@ -50,8 +50,7 @@ class Application < Rails::Application
     # Do not swallow errors in after_commit/after_rollback callbacks.
     # config.active_record.raise_in_transactional_callbacks = true
 
-    config.before_initialize do
-      config.taxonomy_navigation_links_out = config_for(:taxonomy_navigation_links_out)
-    end
+    # Load links out configuration for taxonomy navigation
+    config.taxonomy_navigation_links_out = config_for(:taxonomy_navigation_links_out)
   end
 end