Accessibility: Media: Make the toolbar and inline uploader visual order always match the DOM order.

Depending on the specific media view, the media UI elements are placed in a
different visual order. This change makes sure their visual order always
matches the DOM order.

Propos syhc, audrasjb, afercia.
See #37188.
Fixes #48403.

Built from https://develop.svn.wordpress.org/trunk@47217


git-svn-id: https://core.svn.wordpress.org/trunk@47017 1a063a9b-81f0-0310-95a4-ce76da25c4cd