Code Modernisation: Replace `call_user_func_array()` in `wp-admin/includes/ajax-actions.php` with a dynamic function call.

Props jrf.
See #47678.
Built from https://develop.svn.wordpress.org/trunk@46136


git-svn-id: http://core.svn.wordpress.org/trunk@45948 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/ajax-actions.php

@@ -1806,20 +1806,17 @@ function wp_ajax_menu_get_metabox() {
 
 		/** This filter is documented in wp-admin/includes/nav-menu.php */
 		$item = apply_filters( 'nav_menu_meta_box_object', $menus_meta_box_object );
-		ob_start();
-		call_user_func_array(
-			$callback,
-			array(
-				null,
-				array(
+
+		$box_args = array(
 			'id'       => 'add-' . $item->name,
 			'title'    => $item->labels->name,
 			'callback' => $callback,
 			'args'     => $item,
-				),
-			)
 		);
 
+		ob_start();
+		$callback( null, $box_args );
+
 		$markup = ob_get_clean();
 
 		echo wp_json_encode(

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46135';
+$wp_version = '5.3-alpha-46136';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.