Fix score estimation for postscriptname

Before this fix: $ fc-match :postscriptname=LiberationSans LiberationSansNarrow.ttf: "Liberation Sans Narrow" "Regular"

After this fix: $ fc-match :postscriptname=LiberationSans LiberationSans-Regular.ttf: "Liberation Sans" "Regular"

See https://bugzilla.redhat.com/show_bug.cgi?id=1946871