`findBids` returns wrong results (always last bid) for partial orders

[grabbou]

Hey,

Wanted to report that findBids seems to be returning only one (and always the latest one) bid per fungible asset listed on a given auction house.

Expected result would be that findBids returns all the bids instead.

Here's how to reproduce:

1. Create fungible asset and list with auction house
2. Create a bid for one token
3. Execute that bid
4. Call findBids() and see your last bid
5. Create one more bid for the same token
6. Execute that bid
7. Call findBids() and still see only one bid, but this time, the last one. It should return two