Kartra "?r_done=1" remover

/*
 * Remove Kartra's r_done=1 from custom-domain URLs in modern browsers.
 * Paste in HEAD tracking section. Provided AS-IS. Use at your own risk.
 */
if (history.replaceState) {
var ls = location.search, params = [], reset = false;
ls && ls.substring(1).split('&').forEach(function (param) {
if ('r_done=1' === param) reset = true; else params.push(param);
});
if (reset) history.replaceState(null, '', location.origin + ((location.pathname.length > 1) ? location.pathname : '') + (params.length ? ('?' + params.join('&')) : '') + location.hash);
}