Fix tabbing order when opening/closing post status and visibility in the...

Fix tabbing order when opening/closing post status and visibility in the Publish postbox and cache some of the jQuery selectors. Part-props atimmer, fixes #25460.
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git-svn-id: https://core.svn.wordpress.org/trunk@26911 1a063a9b-81f0-0310-95a4-ce76da25c4cd