fix(designer): fixed designer for pyenv and venv; closes #237
Description
Fixed designer's pythonpath for pyenv and venv environments.
Additional Comments
There is still an error message printed regarded an unknown option c. This also happens without this fix and so far, I couldn't figure out where this is coming from... Once we figure it out, we should push those changes also to pyside
Definition of Done
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Documentation is up-to-date.