quickdump: don't close stdout

[hannes99]

elektraQuickdumpSet always(at the end or on failure) closed file, which makes sense, but file can be stdout in which case it should not be closed.

Should be merge after #4469 since a TODO added in acecca9e8f0e56d4aad7cfab76c16f92bc735569 is removed.

Basics

• [x] Short descriptions of your changes are in the release notes (added as entry in doc/news/_preparation_next_release.md which contains _(my name)_) Please always add something to the release notes.
• [x] Details of what you changed are in commit messages (first line should have module: short statement syntax)
• [ ] References to issues, e.g. close #X, are in the commit messages.
• [ ] The buildservers are happy. If not, fix in this order:
  • [ ] add a line in doc/news/_preparation_next_release.md
  • [ ] reformat the code with scripts/dev/reformat-all
  • [ ] make all unit tests pass
  • [ ] fix all memleaks
• [x] The PR is rebased with current master(+1).

Checklist

• [ ] I added unit tests for my code
• [ ] I fully described what my PR does in the documentation (not in the PR description)
• [ ] I fixed all affected documentation
• [ ] I added code comments, logging, and assertions as appropriate (see Coding Guidelines)
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[hannes99]

jenkins build libelektra please

[hannes99]

jenkins build libelektra please

[hannes99]

jenkins build libelektra please

[markus2330]

Thank you! :revolving_hearts: