When there is no wallet, filter out priced deals from query responses

[rvagg]

Currently they are just sorted lower, but if we can't pay then we shouldn't even attempt: https://github.com/application-research/autoretrieve/blob/1d2d50a84b6c1dcc27050e703be27afb9fa274de/filecoin/retriever.go#L200

Filclient will fail on these after trying to set up a payment channel and failing.