Fix installation path of `__init__.py`

[azeey]

🦟 Bug fix

Summary

__init__.py was not being installed to the proper directory if USE_SYSTEM_PATHS_FOR_PYTHON_INSTALLATION was set.

Checklist

• [ ] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

Merging #364 (b7d2a3b) into main (4372e74) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b7d2a3b differs from pull request most recent head 3183819. Consider uploading reports for the commit 3183819 to get more accurate results

@@           Coverage Diff           @@
##             main     #364   +/-   ##
=======================================
  Coverage   95.43%   95.43%           
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  Files          10       10           
  Lines        1030     1030           
=======================================
  Hits          983      983           
  Misses         47       47