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

Props jrf.
See #47678.
Built from https://develop.svn.wordpress.org/trunk@46135


git-svn-id: http://core.svn.wordpress.org/trunk@45947 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-template.php

@@ -1524,8 +1524,7 @@ function walk_page_tree( $pages, $depth, $current_page, $r ) {
 		}
 	}
 
-	$args = array( $pages, $depth, $r, $current_page );
-	return call_user_func_array( array( $walker, 'walk' ), $args );
+	return $walker->walk( $pages, $depth, $r, $current_page );
 }
 
 /**

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46134';
+$wp_version = '5.3-alpha-46135';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.