Admin can't move project to namespace he doesn't own

Created by: astax-t

In Gitllab 5.1 any user with admin access could move projects between projects groups even if he doesn't own them.

In 5.3 this is not possible anymore - the project group dropdown shows only groups owned by the current user, even when accessing via admin interface.

Steps to reproduce:

1. Log on as a user with admin access level
2. Go to Admin area -> Any project -> "Edit" button -> "Transfer" link on the left (the final URL should look like http://hostname.tld/gitlab/group_name/project_name/edit)
3. Note the namespace selection control

Expected: Should be able to select any namespace (projects group)

Actual result: Only namespaces (groups) owned by the current user are shown, the same as when adding a new project in not admin area.