Fix subcategories pagination

[dominik-zeglen]

Resolves #72

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #249 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #249   +/-   ##
=======================================
  Coverage   74.52%   74.52%           
=======================================
  Files         593      593           
  Lines        6351     6351           
  Branches     1043     1043           
=======================================
  Hits         4733     4733           
  Misses       1435     1435           
  Partials      183      183

Impacted Files	Coverage Δ
src/categories/fixtures.ts	100% <ø> (ø)	⬆️

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