uniconvertor fixed Portfile

I have fixed uniconvertor Macports’ Portfile found here: https://trac.macports.org/attachment/ticket/26016/uniconvertor.tgz. uniconvertor is an Inkscape’s vector graphics converter. You can use these Portfiles in your own local Macport repository following instructions at: http://guide.macports.org/chunked/development.local-repositories.html.