Fixes membership renewal response

api/membership.php

@@ -97,7 +97,7 @@ try {
 /* Get and format user */
 $user = NULL;
 try {
-    $user = get_user($data['user_id']);
+    $user = get_user_data($data['user_id']);
 } catch(InsideDatabaseException $e) {
     error_log($e->getMessage());
     return_json_response(array('error' => 'db_error', 'error_message' => $e->getMessage()), 500);
@@ -106,4 +106,4 @@ try {
 send_membership_confirmation_mail($user, $first_user_membership);
 
 /* Return encrypted user object */
-return_json_response($user);
+return_json_response(array('user' => $user) );