invalid HTML when create new DNS SPF & DMARC record

short description

When I create a new DNS SPF or DMARC record, there is "/>" next to the "Active" checkbox, after checking the HTML, it is: <input type="checkbox" value="1" id="active" name="active" <input=""> /> But no such problem when edit existing SPF or DMARC record.

correct behaviour

<input type="checkbox" value="1" id="active" name="active" checked="">

environment

Server OS: CentOS Server OS version: 7.3.1611 ISPConfig version: 3.1.14p2

proposed fix

Pre-defined to check checkboxes at the beginning of function onShowEnd() in /usr/local/ispconfig/interface/web/dns/dns_spf_edit.php

	function onShowEnd() {
		global $app, $conf;

		$zone = $app->functions->intval($_GET['zone']);

		// pre-defined to check checkboxes
		$app->tpl->setVar("active", "CHECKED");
		$app->tpl->setVar("spf_a_active", "CHECKED");
		$app->tpl->setVar("spf_mx_active", "CHECKED");

		//* check for an existing spf-record
		$sql = "SELECT data, active FROM dns_rr WHERE data LIKE 'v=spf1%' AND zone = ? AND " . $app->tform->getAuthSQL('r');
		$rec = $app->db->queryOneRecord($sql, $zone);
		if ( isset($rec) && !empty($rec) ) {

screenshots