Media: Make the pre-upload-ui hooks share an element with the post-upload-ui...

Media: Make the pre-upload-ui hooks share an element with the post-upload-ui hooks. see #22186, #21390.


git-svn-id: https://core.svn.wordpress.org/trunk@22819 1a063a9b-81f0-0310-95a4-ce76da25c4cd