XWIKI-16073: Stop bundling the watchlist in XWiki Standard.
XWIKI-16073: Stop bundling the watchlist in XWiki Standard.

* Update the plugin list (remove diff plugin as well, as it was introduced by a dependency of the Watchlist).

xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform