"PATH_INFO" unnecessarily assigned twice

A little cleanup: Around line 934 of tools.py, "PATH_INFO" is
unnecessarily assigned twice:

    env = {
        "HTTP_USER_AGENT": "static renderer",
        "REQUEST_METHOD": "GET",
        "HTTP_HOST": "localhost",
        "PATH_INFO": pathinfo,
        "QUERY_STRING": querystring,
        "REQUEST_URI": pathinfo + "?" + querystring,
        "PATH_INFO": pathinfo,
        "HTTP_REFERER": "",
        "REMOTE_ADDR": "",
        "SCRIPT_NAME": "",
        "wsgi.errors": sys.stderr,
        "wsgi.input": None
    }

Steve

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