Trailing forward slash removed (@path)

The @path variable had a trailing forward slash at the end, which doesn’t quite make sense when writing urls like ``@path/whatever`` (previously, we wrote urls like ``@pathwhatever``, which was weird). I modified the file ``app/page-data.inc.php`` to remove the trailing forward slash (``/``) on line 227.

Users of templates that employ ``@path`` may find that they'll need to change their code &mdash; unless the code was incorrect before (rendering an extra forward slash, like the template).