SF-3604 Fix download of historic drafts

[pmachapman]

This PR fixes the downloading of historic builds as zip files.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.20%. Comparing base (8c23863) to head (e2e20cc).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...SIL.XForge.Scripture/Services/MachineApiService.cs	97.43%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3497      +/-   ##
==========================================
+ Coverage   82.19%   82.20%   +0.01%     
==========================================
  Files         615      615              
  Lines       36995    37025      +30     
  Branches     6059     6044      -15     
==========================================
+ Hits        30409    30438      +29     
- Misses       5690     5703      +13     
+ Partials      896      884      -12     

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[RaymondLuong3]

@RaymondLuong3 reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @pmachapman)

[RaymondLuong3]

@RaymondLuong3 reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @pmachapman)