MDL-51790 block_community: xmlrpc expects correct types

This is defined as an int on the hub site, so it must be sent as an int.

blocks/community/communitycourse.php

@@ -193,7 +193,7 @@ if (optional_param('executesearch', 0, PARAM_INT) and confirm_sesskey()) {
 
     $function = 'hub_get_courses';
     $params = array('search' => $search, 'downloadable' => $downloadable,
-        'enrollable' => !$downloadable, 'options' => $options);
+        'enrollable' => intval(!$downloadable), 'options' => $options);
     $serverurl = $huburl . "/local/hub/webservice/webservices.php";
     require_once($CFG->dirroot . "/webservice/xmlrpc/lib.php");
     $xmlrpcclient = new webservice_xmlrpc_client($serverurl, $token);