Code Modernisation: Remove redundant call to `func_get_arg()` in `wp-includes/class-wp-rewrite.php`.

Props jrf.
See #47678.
Built from https://develop.svn.wordpress.org/trunk@46141


git-svn-id: http://core.svn.wordpress.org/trunk@45953 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-rewrite.php

@@ -1684,7 +1684,7 @@ class WP_Rewrite {
 		global $wp;
 
 		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
-		if ( true === $query_var || null === func_get_arg( 2 ) ) {
+		if ( true === $query_var || null === $query_var ) {
 			$query_var = $name;
 		}
 		$this->endpoints[] = array( $places, $name, $query_var );

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46140';
+$wp_version = '5.3-alpha-46141';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.