Fix: don't orphan children when filtering out parents

[emmercm]

Fixes: #987

[github-actions[bot]]

:test_tube: Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/fix-orphaned-children" [commands..] [options]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 93.37%. Comparing base (768bfc3) to head (0a1f97f).

Files	Patch %	Lines
src/modules/datFilter.ts	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #989 +/- ## ========================================== - Coverage 93.38% 93.37% -0.02% ========================================== Files 89 89 Lines 5582 5588 +6 Branches 1300 1303 +3 ========================================== + Hits 5213 5218 +5 - Misses 351 352 +1 Partials 18 18 ```

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[github-actions[bot]]

:lock: Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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