beta_min and beta_max must be consistent with changing vartype

[K-Suzuki-Jij]

The cooling schedule does not seem to be consistent with changing vartype

import openjij as oj
model = oj.BinaryPolynomialModel({(0,1):-1}, "SPIN")
res = oj.SASampler().sample_hubo(model.to_hising(), "SPIN")
res.info['schedule']
{'beta_max': 2.302585092994046, 'beta_min': 0.34657359027997264, 'num_sweeps': 1000}

res = oj.SASampler().sample_hubo(model.to_hubo(), "BINARY")
res.info['schedule']
{'beta_max': 1.5350567286626973, 'beta_min': 0.11552453009332421, 'num_sweeps': 1000}

Above two cases should have the same cooling schedule.
This inconsistency also occurs in sample_ising and sample_qubo.