Coding Standards: Include one space after function keyword for closures.

Note: This is enforced by WPCS 3.0.0.

Reference: [https://github.com/WordPress/WordPress-Coding-Standards/pull/2328 WPCS: PR #2328 Core: properly check formatting of function declaration statements].

Props jrf.
See #59161, #58831.
Built from https://develop.svn.wordpress.org/trunk@56559


git-svn-id: http://core.svn.wordpress.org/trunk@56071 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/update-core.php

@@ -1805,7 +1805,7 @@ function _upgrade_422_find_genericons_files_in_folder( $directory ) {
 	$dirs = glob( $directory . '*', GLOB_ONLYDIR );
 	$dirs = array_filter(
 		$dirs,
-		static function( $dir ) {
+		static function ( $dir ) {
 			/*
 			 * Skip any node_modules directories.
 			 *