collapse.js: pass hafas parameter as-is

	$('div.app > ul > li').click(function(event) {

		const trainElem = $(this);

		const station = $('div.app').data('station');

		const param = new URLSearchParams(window.location.search);

		event.preventDefault();

		var suffix = '?';

		if (window.location.href.includes('detailed=1')) {

		if (param.get('detailed')) {

			suffix += '&detailed=1';

		}

		if (window.location.href.includes('hafas=1')) {

			suffix += '&hafas=1&highlight=' + trainElem.data('station');

		if (param.get('hafas')) {

			suffix += '&hafas=' + param.get('hafas') + '&highlight=' + trainElem.data('station');

		}

		if (window.location.href.includes('past=1')) {

		if (param.get('past')) {

			suffix += '&past=1';

		}

		if (window.location.href.includes('rt=1') || window.location.href.includes('show_realtime=1')) {

		if (param.get('rt') || param.get('show_realtime')) {

			suffix += '&rt=1';

		}

		if (window.location.href.includes('hafas=1')) {

		if (param.get('hafas')) {

			history.pushState({'page':'traindetail','jid':trainElem.data('jid')}, 'test', '/z/' + trainElem.data('jid') + suffix);

		} else {

			history.pushState({'page':'traindetail','station':station,'train':trainElem.data('no')}, 'test', '/z/' + trainElem.data('train') + '/' + trainElem.data('station') + suffix);