Resort imports in tests

[jxltom]

A followup to #3412, this PR resorts the imports in tests.

Pull Request Checklist

1. Privileged views and APIs are guarded by proper permission checks.
2. All visible strings are translated with proper context.
3. All data-formatting is locale-aware (dates, numbers, and so on).
4. Database queries are optimized and the number of queries is constant.
5. Database migration files are up to date.
6. The changes are tested.
7. The code is documented (docstrings, project documentation).
8. GraphQL schema and type definitions are up to date.
9. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #3471 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3471   +/-   ##
=======================================
  Coverage   89.75%   89.75%           
=======================================
  Files         237      237           
  Lines       12943    12943           
  Branches     1312     1312           
=======================================
  Hits        11617    11617           
  Misses        922      922           
  Partials      404      404

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