Prevent 'paged-*' from being added to body classes on 404 error pages.

props psoluch.
see #16468.

git-svn-id: https://develop.svn.wordpress.org/trunk@28249 602fd350-edb4-49c9-b593-d223f7449a82
Prevent 'Page %s' from being added to page title on 404 error pages in bundled themes.

props psoluch, rob1n.
fixes #16468.

git-svn-id: https://develop.svn.wordpress.org/trunk@28250 602fd350-edb4-49c9-b593-d223f7449a82