Dynare++: fix --steps option

Using

dynare++ --steps 1 example1.mod

returns

Caught TL exception: At ../tl/cc/t_container.hh:186:NaN or Inf asserted in TensorContainer::insert

See https://forum.dynare.org/t/steps-option-not-working/18634

changed milestone to %5.x

added bug label

assigned to @sebastien

Bisection shows that the bug was introduced in 6d99b6d1.

closed with commit 5eb76900

mentioned in commit da0578cd