[DownloadButton] Simplify with switch statements.

[imnasnainaec]

This change is 

[jmgrady]

Reviewed 1 of 1 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[codecov-io]

Codecov Report

Merging #886 (b3f8626) into master (d269954) will decrease coverage by 0.10%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   51.01%   50.91%   -0.11%     
==========================================
  Files         241      241              
  Lines        6590     6601      +11     
  Branches      418      421       +3     
==========================================
- Hits         3362     3361       -1     
- Misses       2918     2926       +8     
- Partials      310      314       +4     

Flag	Coverage Δ
backend	56.15% <ø> (ø)
frontend	45.65% <20.00%> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
src/components/ProjectExport/DownloadButton.tsx	29.03% <20.00%> (-15.97%)	⬇️
.../MergeDupGoal/MergeDupStep/MergeDupStepReducer.tsx	50.64% <0.00%> (-1.30%)	⬇️

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