Fix failing MAP when only a subset of variables is used #5445
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Reduced tolerance for optimization that includes discrete variable in
test_find_MAP_discrete
. It is unclear whether the original reference had a theoretical/empirical meaning or just happened to be the result obtained when the test was created.Since the less stable Powell method is used in that case, and since the result is still pretty close to the original reference, I think it's safe to just lower the test threshold.
Closes #4771