DefaultAuthorizationManager doesn't properly set the wiki reference

Reproduction steps:

• Create a subwiki foo
• Create a page Bar in that subwiki
• Go to Admin > Rights in the subwiki only and set "prevent unregistered users to view pages"
• Try to access as guest user to http://localhost:8080/xwiki/rest/wikis/foo/spaces/Bar/pages/WebHome

Expected result:

• The answer should be a 401 authorization denied

Obtained result:

• All info about the page are available, as if guest had view right