Removed useless test in misc/cron/archive.php

In the past, `misc/cron/archive.php` used to be included in the console command `core:archive`. But not anymore, so this test can be removed.

misc/cron/archive.php

@@ -22,12 +22,10 @@ if (!defined('PIWIK_USER_PATH')) {
     define('PIWIK_USER_PATH', PIWIK_INCLUDE_PATH);
 }
 
-if (!class_exists('Piwik\Console', false)) {
-    define('PIWIK_ENABLE_DISPATCH', false);
-    define('PIWIK_ENABLE_ERROR_HANDLER', false);
-    define('PIWIK_ENABLE_SESSION_START', false);
-    require_once PIWIK_INCLUDE_PATH . "/index.php";
-}
+define('PIWIK_ENABLE_DISPATCH', false);
+define('PIWIK_ENABLE_ERROR_HANDLER', false);
+define('PIWIK_ENABLE_SESSION_START', false);
+require_once PIWIK_INCLUDE_PATH . "/index.php";
 
 if (!empty($_SERVER['argv'][0])) {
     $callee = $_SERVER['argv'][0];