credential: fix default website url in password reset email

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/CredentialRecovery_sendPasswordResetLink.xml

@@ -66,7 +66,7 @@ if message_reference is None:\n
 notification_message = portal.NotificationTool_getDocumentValue(message_reference,\n
                                                                 context.getLanguage())\n
 \n
-context.REQUEST.set(\'came_from\', portal.absolute_url())\n
+context.REQUEST.set(\'came_from\', context.getUrlString())\n
 \n
 if context.hasStopDate():\n
   kw = {\'expiration_date\':context.getStopDate()}\n