Clean up rendering of the title column in the posts list table. Simplify branching. Use get_userdata() rather than get_user_by( 'id' ). Change string to '%s is currently editing'. see #23312.


git-svn-id: https://core.svn.wordpress.org/trunk@23372 1a063a9b-81f0-0310-95a4-ce76da25c4cd