Block Editor: Fix the TinyMCE wordpress plugin to handle hiding/showing of toolbars in the classic block. Change the classic block toolbar to use the (now fixed) wp_adv button.

Props azaozz.
Merges [43889] and [43890] to trunk.
Fixes #45264.

git-svn-id: https://develop.svn.wordpress.org/trunk@44247 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -517,7 +517,7 @@ function wp_default_packages_inline_scripts( &$scripts ) {
 		'wp_more',
 		'spellchecker',
 		'wp_add_media',
-		'kitchensink',
+		'wp_adv',
 	);
 
 	/* This filter is documented in wp-includes/class-wp-editor.php */