Multisite: Correct default values for orderby and order in WP_Site_Query::__construct().

Add a unit test.

Props ramiy, SergeyBiryukov.
See #35791.

git-svn-id: https://develop.svn.wordpress.org/trunk@38085 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-site-query.php

@@ -155,8 +155,8 @@ class WP_Site_Query {
 			'number'            => 100,
 			'offset'            => '',
 			'no_found_rows'     => true,
-			'orderby'           => 'ids',
-			'order'             => 'DESC',
+			'orderby'           => 'id',
+			'order'             => 'ASC',
 			'network_id'        => 0,
 			'network__in'       => '',
 			'network__not_in'   => '',