Tests: Update legacy arguments passed to WP_UnitTest_Factory_For_Blog::create_object().

This converts the arguments originally meant for `wpmu_create_blog()` to the ones used by `wp_insert_site()`.

Follow-up to [47011].

Fixes #47195.

git-svn-id: https://develop.svn.wordpress.org/trunk@47013 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/user/getActiveBlogForUser.php

@@ -83,7 +83,7 @@ if ( is_multisite() ) :
 			$site_id = self::factory()->blog->create(
 				array(
 					'user_id' => self::$user_id,
-					'meta'    => array( 'spam' => 1 ),
+					'spam'    => 1,
 				)
 			);