[VCF] Fix an importing error in the params as dictionary

[viccollado]

When you use a dictionary to set the parameters, if you include in the dictionary the values of: p, starting_point, pen1, pen2, factor_pen2, bund_mu_start, performance_warnings, numba; but you did not include them as parameters, then these values are ommited and the default values in Optimizer are used.

Example, I was using this code:

params = {
    'p'                            : p_level,
    'starting_point'               : np.array([0.5, 1.5, 0.01], dtype=np.float64),
    'pen1'                         : 400.0,
    'pen2'                         : 600.0,
    'pen2_factor'                  : 1.25,
    'bund_mu_start'                : 38.0,
    'bund_mu_low'                  : 1e-3,
    'bund_mu_high'                 : 1e3,
    'bund_mu_inc'                  : 1.05,
    'bund_mu_dec'                  : 0.95,
    'bund_kappa'                   : 1e-4,
    'bund_max_size_bundle_set'     : 20,
    'bund_delta_tol'               : 1e-7,
    'bund_restarting_period'       : 300,
    'bund_mu_restart'              : 38.0,
    'bund_restarting_penalty_slack': 1e-5,
    'bund_restarting_epsilon_eta'  : 1e-4,
    'bund_scaling_term'            : 1.0,
    'bund_epsilon_alpha'           : 0.01,
    'nb_iterations'                : 150,
    'superquantile_smoothing_param': 0.1,
    'numba'                        : False,
    'performance_warnings'         : False,
}


optimizer = Optimizer(problem, params=params)
solution  = optimizer.run(verbose=True)

When I run it, since I did not include

Optimizer(problem, params=params, p=p_level, starting_point=[], ...)

the values of p, starting point,... was set as the default ones.