Hide the "If you take over" string from the post locked dialog when the override_post_lock filter is used to prevent an override.

props azaozz.
fixes #24930.

Built from https://develop.svn.wordpress.org/trunk@25694


git-svn-id: http://core.svn.wordpress.org/trunk@25609 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Reverse the order of roles in wp_dropdown_roles(). Reset to 'subscriber' when the default role is removed and when a save is invalid.

props garyc40, wonderboymusic.
fixes #14578.

Built from https://develop.svn.wordpress.org/trunk@25695


git-svn-id: http://core.svn.wordpress.org/trunk@25610 1a063a9b-81f0-0310-95a4-ce76da25c4cd