Changed $article to be instance of WikiPage

First argument of stableVersionUpdates must be an instance of Wikipage or
Title, Article given over autoReviewEdit from reviewAllpages.php maintenance
script. Changed to init Class WikiPage instead of Article.

Bug: 59012
Change-Id: I3201b260a9a75966726ecdb31254dbbc4bc524c9
Merge "Changed $article to be instance of WikiPage"