Fix: Cannot remove OpenID

OpenidsettingsAction::removeOpenID() was comparing and int with a string
so always displayed "That OpenID does not belong to you."

plugins/OpenID/classes/User_openid.php

@@ -45,6 +45,16 @@ class User_openid extends Managed_DataObject
         );
     }
 
+    public function getID()
+    {
+        if (!isset($this->user_id)) {
+            throw new Exception('No ID set.');
+        } elseif (empty($this->user_id)) {
+            throw new Exception('Empty ID for object! (not inserted yet?).');
+        }
+        return intval($this->user_id);
+    }
+
     static function hasOpenID($user_id)
     {
         $oid = new User_openid();