XWIKI-9456: After the creation of a new (sub)wiki, the Distribution Wizard should not appear.

* Rename xwiki.extension.distribution.oldwikiui to xwiki.extension.distribution.wikiui
* Inverse xwiki.extension.distribution.wikiui to xwiki.extension.distribution.workspaceui
* Take this change into account in the migrator.
Merge pull request #46 from gdelhumeau/XWIKI-9456

XWIKI-9456: After the creation of a new (sub)wiki, the Distribution Wizard should not appear.