Fix mismatch in id_queue triggering obscure errors in QuestaSim

[FrancescoConti]

The error has been reported in the past in a closed issue in PULPissimo: https://github.com/pulp-platform/pulpissimo/issues/71#issuecomment-522698136

but is also triggered in other conditions (e.g., on work that is not yet open-source). The fix is trivial.