Revert type="email" (HTML5) as some browsers that do validation on these...

Revert type="email" (HTML5) as some browsers that do validation on these fields do not work for IDN domains yet. Core does not support these well either, but server-side validation can at least be dealt with by a plugin. see #17863.



git-svn-id: https://core.svn.wordpress.org/trunk@20196 1a063a9b-81f0-0310-95a4-ce76da25c4cd