Change default metric of soft intersection to Damerau-Levenshtein

[chrislit]

https://github.com/chrislit/abydos/blob/a3715a0c0b63f4a127a622447a42624b812eb459/abydos/distance/_token_distance.py#L216

This isn't possible until DamerauLevenshtein can return an alignment (when the _alignment_matrix method is implemented).