Closes ImportBot importing non-covers (For Amazon Imports)

[b2pacific]

Closes #6089

hotfix

Technical

Currently added the file name of the placeholder image that we could find online, the filename might change in the future.

Testing

Screenshot

Stakeholders

@jimchamp @mekarpeles

[mekarpeles]

This LGTM @jimchamp we may want to patch deploy and manually try adding on testing before merging

[tuminzee]

Hi @b2pacific I updated it with a more meaningful name.

Let's use self-documenting titles for issues and pull requests. When looking at a list like:
https://github.com/internetarchive/openlibrary/pulls

[mekarpeles]

@cdrini + @jimchamp confirmed that the image key of the work coming through our API is:

[{'url': 'https://www.amazon.com/dp/0231206666/?tag=internetarchi-20', 'source_records': ['amazon:0231206666'], 'isbn_10': ['0231206666'], 'isbn_13': ['9780231206662'], 'price': '$90.00', 'price_amt': 9000, 'title': 'The Modern Presidency: Six Debates That Define the Institution', 'cover': 'https://m.media-amazon.com/images/I/01RmK+J4pJL._SL500_.gif', 'authors': [{'name': 'Genovese, Michael'}], 'publishers': ['Columbia University Press'], 'number_of_pages': 160, 'edition_num': None, 'publish_date': 'Sep 20, 2022', 'product_group': 'Book', 'physical_format': 'hardcover'}]

which matches 01RmK+J4pJL

We also confirmed with 9786057834683

[jimchamp]

Lgtm, thanks @b2pacific!