Pad value not being used in `align_right` function

[shuishida]

It seems that the pad_id parameter is not being used in the align_right function when calling `F.pad(..., value=0).

x-transformers/x_transformers/autoregressive_wrapper.py

Line 51 in 144d9ba

t = F.pad(t, (max_pad_len, 0), value = 0)