MDL-52718 block_community: Send XML-RPC request correctly

mnet has its own separate XML-RPC implementation which supports
introspection. So even though we were sending incorrectly formatted
parameters, our previous XML-RPC implementation could work out how
to mangle the parameters to be correct. Introspection is not a
part of the XML-RPC specification and we should not rely on it. Our
current XML-RPC client/server implementation does not support it either.

Therefore we should always send data in the expected format.

blocks/community/communitycourse.php

@@ -198,7 +198,7 @@ if (optional_param('executesearch', 0, PARAM_INT) and confirm_sesskey()) {
     require_once($CFG->dirroot . "/webservice/xmlrpc/lib.php");
     $xmlrpcclient = new webservice_xmlrpc_client($serverurl, $token);
     try {
-        $result = $xmlrpcclient->call($function, $params);
+        $result = $xmlrpcclient->call($function, array_values($params));
         $courses = $result['courses'];
         $coursetotal = $result['coursetotal'];
     } catch (Exception $e) {