In `media_upload_gallery_form()`'s inline JavaScript, remove unnecessary comment tags.

Fixes #25637.



git-svn-id: https://develop.svn.wordpress.org/trunk@28368 602fd350-edb4-49c9-b593-d223f7449a82
In the `Attachment Details` section of the media modal, only add `box-shadow` to images. Other mime-type icons look strange with an arbitrary border.

Props avryl.
Fixes #27949.



git-svn-id: https://develop.svn.wordpress.org/trunk@28369 602fd350-edb4-49c9-b593-d223f7449a82