Revisions: don't set revisions post_author with get_post_meta( $ID, '_edit_last' ). Not needed since we create revisions after saving the post and breaks per-user autosaves, see #16215

git-svn-id: https://core.svn.wordpress.org/trunk@23933 1a063a9b-81f0-0310-95a4-ce76da25c4cd