Removed another forgotten f-string for Python 3.5 compatibility (HTCONDOR-943)
Removed another forgotten f-string for Python 3.5 compatibility (HTCONDOR-943)

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