Fixed some parameter discrepancy for MDAM

[bokveizen]

Fixed some parameter discrepancy for MDAM. But the encoder still raises ValueError. See GraphAttentionEncoder at models/zoo/mdam/encoder.py. ValueError: too many values to unpack (expected 3); here self.attention_layer(h_old) is a single tensor h_new, attn, V = self.attention_layer(h_old)