Script Loader: In `wp_default_packages_inline_scripts()`, make sure the root...

Script Loader: In `wp_default_packages_inline_scripts()`, make sure the root URL middleware is registered before using the media middleware.

This allows for requests to retry post-processing large images using the `post-process` REST API endpoint to work as expected.

Props azaozz, mikeschroder, TimothyBlynJacobs, epiqueras, johnbillion, youknowriad.
Fixes #48542.
Built from https://develop.svn.wordpress.org/trunk@46703


git-svn-id: https://core.svn.wordpress.org/trunk@46503 1a063a9b-81f0-0310-95a4-ce76da25c4cd