A minor update dnn_filterbank_config.py

[sajjadkarimi91]

In dnn_filterbank.py line 19, the config is called without any underline for the four last items.

    self.Wbl = tf.constant(self.tri_filter_shape(self.config.n_dim,
                                                 self.config.nfilter,
                                                 self.config.fmin,
                                                 self.config.fmax,
                                                 self.config.flow,
                                                 self.config.fhigh), dtype=tf.float32, name="W-filter-shape")