Fixed xss-filter part which was useless

[nicosomb]

Graby has a xss-filter parameter in the configuration but it was useless because the sanitized text was not re-used.

[j0k3r]

I would rather override $infos['html'].

$infos = $this->doFetchContent($url);

// filter xss?
if ($this->config['xss_filter']) {
    $this->logger->log('debug', 'Filtering HTML to remove XSS');

    $infos['html'] = htmLawed($infos['html'], array(
        'safe' => 1,
        'deny_attribute' => 'style',
        'comment' => 1,
        'cdata' => 1,
    ));
}

// generate summary
$infos['summary'] = $this->getExcerpt($infos['html']);

[nicosomb]

Ready to be squashed.

[j0k3r]

Squash allowed 🚀

[coveralls]

Coverage remained the same at 98.574% when pulling 7783d02 on nicosomb:fix-xss-filter into 1bd94d8 on j0k3r:master.