incoming/web: normalize fileID when canceling

[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

```diff @@ 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](https://app.codecov.io/gh/moov-io/achgateway/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=moov-io) | Coverage Δ | | |---|---|---| | [internal/incoming/web/api\_files.go](https://app.codecov.io/gh/moov-io/achgateway/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=moov-io#diff-aW50ZXJuYWwvaW5jb21pbmcvd2ViL2FwaV9maWxlcy5nbw==) | `68.00% <100.00%> (+0.32%)` | :arrow_up: | | [internal/pipeline/merging.go](https://app.codecov.io/gh/moov-io/achgateway/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=moov-io#diff-aW50ZXJuYWwvcGlwZWxpbmUvbWVyZ2luZy5nbw==) | `60.51% <66.66%> (ø)` | |

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