incoming/web: normalize fileID when canceling

[adamdecaf]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (beda56b) 47.24% compared to head (03744a0) 47.25%.
Report is 5 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
+ Coverage   47.24%   47.25%   +0.01%     
==========================================
  Files          87       87              
  Lines        3863     3864       +1     
==========================================
+ Hits         1825     1826       +1     
  Misses       1719     1719              
  Partials      319      319              

Files	Coverage Δ
internal/incoming/web/api_files.go	68.00% <100.00%> (+0.32%)	⬆️
internal/pipeline/merging.go	60.51% <66.66%> (ø)

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