Theme call prevents theming

urlicon_replace() contains a theme call that is hardcoded, so prevents overriding via the theme system.

$link = theme_urlicon($match[3], $favicon, $match[1], array('alt' => '', 'title' => t('favicon'), 'class' => 'urlicon ui-'. $domain));

should be replaced with

$link = theme('urlicon', $match[3], $favicon, $match[1], array('alt' => '', 'title' => t('favicon'), 'class' => 'urlicon ui-'. $domain));