chore: Stabilises should compare viewport screenshots test

[pan-kot]

This fix makes "should compare viewport screenshots" test stable. Before the fix it fails almost always when run locally and every 2nd time when run in GitHub actions.

After the fix I run it 100 times locally and it GitHub actions and it failed not a single time.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.81%. Comparing base (82d27fc) to head (18d2008).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   91.81%   91.81%           
=======================================
  Files          18       18           
  Lines         403      403           
  Branches       68       68           
=======================================
  Hits          370      370           
  Misses         29       29           
  Partials        4        4           

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