When you are logged with a global user in a subwiki open for both global and local users you are not able to see the "Home" button

Steps to reproduce:

1. Create a wiki
2. Select the "User scope" - Both global and local users are available in the wiki

a) When the user is local is normal to not see the "Home" button (for Main wiki)
b) When the user is global is not really normal to not see the "Home" button. When he wants to return to Main wiki he needs to modify the URL to do that.