Register link present when Project studio enabled and signup_enabled is false

There seems to be a Register link when signup_enabled application setting is false

Steps to reproduce:

• Enable Project Studio
• https://gdk.test:3443/admin/application_settings/general#js-signup-settings <- disable sign-ups
• Navigate to a user when not signed in https://gdk.test:3443/root

Expect:

• No Register button

new UI	old UI

This was found due to a failing system test:

GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED=true rspec './spec/features/users/show_spec.rb:340'  --fail-fast