Jeremy Felt 796ceebb25 Use common core syntax for checking DOING_AJAX
Our current check for a non truthy `DOING_AJAX` is `! DOING_AJAX`.

props TobiasBg
Fixes #29891

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git-svn-id: http://core.svn.wordpress.org/trunk@30177 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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