Redundant essential theme call.

[Gareth Barnard]

In lib.php::theme_adaptable_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options = array()) there is:

    } else if ($filearea === 'style') {
        theme_essential_serve_css($args[1]);

is this in broken pencil territory?

[Info 3bits]

Inherited from BCU. Probably could be removed.

See https://bitbucket.org/covuni/moodle-theme_bcu/src/a26fc63b372e763bd083e7073324de90cc6cf0bb/lib.php?at=master&fileviewer=file-view-default#lib.php-279