ltlsynt: fix lar.old implementation
* bin/ltlsynt.cc: Make sure to_parity_old() receive a deterministic automaton, for correctness. Also call reduce_parity() afterward, to match what was done in 2.8.7. * tests/core/ltlsynt.test: Include lar.old in the comparison of all results to make sure it give the same result as the other 3 algorithms.
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