Revert a piece of [19424], go back to cloning a div for adding images in Press...

Revert a piece of [19424], go back to cloning a div for adding images in Press This. props azaozz, see #19498 for trunk.

git-svn-id: https://core.svn.wordpress.org/trunk@19664 1a063a9b-81f0-0310-95a4-ce76da25c4cd