Fix records with wrong ASIN/BWBID as a result of import api bug

For some amount of time, the import endpoint has been incorrectly matching a book on `source_record` alone. This means that if no better data (eg isbn) was available, it would match _any_ item in the same bwb palette when we import promise items.

Here's an example of a bad edit: https://openlibrary.org/books/OL30383M/Departures?_compare=Compare&b=15&a=14&m=diff

- The ASIN point to other books!
- In this case we were lucky and it added another BWB SKU to `local_ids`. But it sometimes overwrites the field :( Either way it's wrong and will lead to incorrect matches when partners try to search by BWB SKU