[TOOLS] FIX sofa-launcher stdout

[VannesteFelix]

This PR fix an issue with sofa-launcher.

When we are using sofa-launcher the scene we want to execute is copied in the /tmp directory.
But because we weren't closing the current file it wasn't saved and so wasn't executed.

The fix close it.

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This PR:

• builds with SUCCESS for all platforms on the CI.
• does not generate new warnings.
• does not generate new unit test failures.
• does not generate new scene test failures.
• does not break API compatibility.
• is more than 1 week old (or has fast-merge label).

Reviewers will merge only if all these checks are true.

[sofabot]

Thank you for your pull request!
Someone will soon check it and start the builds.

Note that by submitting a contribution to SOFA, you hereby accept and agree to the terms and conditions detailed in the associated CLA

[hugtalbot]

[ci-build][with-scene-tests]

[damienmarchal]

+1 for this PR.

That also fix problem with the parallel launcher.

[damienmarchal]

I approve :)