fix the pretty-printing of custom reals in TPTP
fix the pretty-printing of custom reals in TPTP

ssaavedra/why3,jpdeplaix/why3,douglas-larocca/why3,ssaavedra/why3,douglas-larocca/why3,douglas-larocca/why3,jpdeplaix/why3,ssaavedra/why3,jpdeplaix/why3