Hides registry if project repository is disabled

## What does this MR do?

When disabling the projects repository it now hides the container registry as well.

## Screenshots (if relevant)

![Screen_Shot_2016-10-21_at_11.23.29](/uploads/e07d74e0666348748690689ab993f9d8/Screen_Shot_2016-10-21_at_11.23.29.png)

![Screen_Shot_2016-10-21_at_11.23.32](/uploads/e2f0757397a4524eca5aa069c1fabad3/Screen_Shot_2016-10-21_at_11.23.32.png)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/19734#note_17224181

See merge request !7036