ThePalaceProject / web-patron / 14365216932

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Grab book format from fulfillment link, if available (PP-2191) (#55)

## Description

Grab book format from a book's list of fulfillment links, if list exists
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## Motivation and Context

While working on a separate ticket, I noticed that books that had been
fulfilled would have their indirect acquisition links removed, and so
the book format would be removed from the book detail page.
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[Jira PP-2191]

## How Has This Been Tested?

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## Checklist:

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- [ ] I have updated the documentation accordingly.
- [x] All new and existing tests passed.

804 of 1048 branches covered (76.72%)

Branch coverage included in aggregate %.

9 of 10 new or added lines in 1 file covered. (90.0%)

1405 of 1578 relevant lines covered (89.04%)

29.62 hits per line