After a migration the Wiki Index lists old-style wikis (not workspaces) as having only the following Membership Type: "Only an admin can invite a user" no matter if the wiki is public or private

Issue originally reported by ralucamorosan.

I did a migration on Jetty/Hsql from 5.2.1 to 5.4RC1. On 5.2.1 I created 2 old-style wikis:

• an open one for which I didn't change any rights
• a private one for which I checked the 3 checkboxes regarding Unregistered users

After the migration if you go to the Wiki Index both subwikis have "Only an admin can invite a user" as the membership type.