Coding Standards: Correct alignment in wp_enqueue_global_styles().

This fixes an `Equals sign not aligned with surrounding assignments; expected 5 spaces but found 1 space` WPCS warning.

Follow-up to [50973], [51819].

See #53359.

git-svn-id: https://develop.svn.wordpress.org/trunk@51944 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/script-loader.php

@@ -2310,8 +2310,9 @@ function wp_enqueue_global_styles() {
 		! is_admin()
 	);
 
-	$stylesheet = null;
+	$stylesheet     = null;
 	$transient_name = 'global_styles_' . get_stylesheet();
+
 	if ( $can_use_cache ) {
 		$cache = get_transient( $transient_name );
 		if ( $cache ) {