Media: When the attachment details view changes to another view or attachment,...

Media: When the attachment details view changes to another view or attachment, save compat fields on destroy. (We already do this for non-compat fields.) props koopersmith. fixes #22776.



git-svn-id: https://core.svn.wordpress.org/trunk@23098 1a063a9b-81f0-0310-95a4-ce76da25c4cd