Script Loader: Remove unused global when enqueuing block scripts and styles.

Follow-up to [44164], [49080], [49093], [50836], [50919], [59823].

Props umesh.nevase, b1ink0, mukesh27.
Fixes #63413.

git-svn-id: https://develop.svn.wordpress.org/trunk@60230 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/script-loader.php

@@ -2679,12 +2679,8 @@ function wp_should_load_block_assets_on_demand() {
  * context (only enqueuing editor scripts while in context of the editor).
  *
  * @since 5.0.0
- *
- * @global WP_Screen $current_screen WordPress current screen object.
  */
 function wp_enqueue_registered_block_scripts_and_styles() {
-	global $current_screen;
-
 	if ( wp_should_load_block_assets_on_demand() ) {
 		return;
 	}