fix -config argument handling for win_install_helper HTCONDOR-543
fix -config argument handling for win_install_helper HTCONDOR-543

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor