Reported by Reuben Rowe.

* spot/twaalgos/complement.cc (complement): Remove the hard-coded
simul=0 option on automata with >32 states.  In 2.10 simul=0 now
implies det-simul=0, causing the regression, and most importantly it
is not needed anymore, because we have other threashold like simul-max
and simul-trans-pruning in place.
* tests/core/complement.test: Add Reuben's automaton as test case.
* NEWS: Mention the fix.