specificLines is broken

[malberts]

Follow-up to #44

When using this wikitext:

{{#embed:https://github.com/ProfessionalWiki/ExternalContent/blob/master/src/EmbedExtensionFactory.php|line|specificLines=10-20}}

The page looks like this:

[malberts]

It looks like the HTML has the hide-line class in the wrong place:

When manually removing the class from the DOM there is a spacing issue on the first line, but also that <?php isn't supposed to be there:

This is the full code with <?php on line 1: