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

[cdrini]

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

[seabelis]

This is what causes the Kindle-specific ASINs to match up with the physical copies? Ex. https://openlibrary.org/books/OL28899016M/Undercover_Connection?v=3

[hornc]

@cdrini is there more clean up to do here, or was #7430 sufficient?