In wp.media.editor:send, revert back to the old field names used by...

In wp.media.editor:send, revert back to the old field names used by media_upload_form_handler() for easier back compat.
Fix notices in wp_ajax_send_attachment_to_editor().

Props nacin, azaozz, miqrogroove
fixes #22553


git-svn-id: https://core.svn.wordpress.org/trunk@22847 1a063a9b-81f0-0310-95a4-ce76da25c4cd