Editor: Fix layout of no-js state in site editor.

Remove padding and adjust classes to match current state of editor.

Props afercia, andraganescu, poena.
Fixes #56228.
Built from https://develop.svn.wordpress.org/trunk@56187


git-svn-id: http://core.svn.wordpress.org/trunk@55699 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/site-editor.php

@@ -172,7 +172,7 @@ require_once ABSPATH . 'wp-admin/admin-header.php';
 	<?php // JavaScript is disabled. ?>
 	<div class="wrap hide-if-js site-editor-no-js">
 		<h1 class="wp-heading-inline"><?php _e( 'Edit site' ); ?></h1>
-		<div class="notice notice-error notice-alt">
+		<div class="notice notice-error">
 			<p>
 				<?php
 					/**