In ResourceLoaderWikiModule, use isCssOrJsPage() as well as isCssJsSubpage() to check whether a wiki page is a CSS or JS page. This is required to make ResourceLoaderWikiModule work for pages that are CSS/JS pages, but don't live in the MediaWiki namespace and aren't user subpages. This wasn't possible before
r93759, which introduced a hook that allows extensions to override which pages are considered to be CSS/JS pages.