Script Loader: Remove unused wp-nux CSS dependency.

Neither `wp-edit-post` nor `wp-editor` use the styles included in the `wp-nux` CSS file. This removes nux as a dependency from the registration of the two files.

Props flixos90, youknowriad, peterwilsoncc.
Fixes #57827.
See #57643.


git-svn-id: https://develop.svn.wordpress.org/trunk@55628 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -1663,12 +1663,10 @@ function wp_default_styles( $styles ) {
 			'wp-editor',
 			'wp-edit-blocks',
 			'wp-block-library',
-			'wp-nux',
 		),
 		'editor'               => array(
 			'wp-components',
 			'wp-block-editor',
-			'wp-nux',
 			'wp-reusable-blocks',
 		),
 		'format-library'       => array(),