Fix non zero constraints distribution amongst processes

[oguevremont]

Description

When running large scale simulations involving the tracer physics, an issue of lack of memory arose. This issue didn't happen when only fluid dynamics or heat transfer physics were solved; only tracer.

Solution

By comparing implementation in other auxiliary physics, it appeared that non-zero constraints were not reinitialized with locally relevant DOFs. This was fixed.

Testing

Large scale tracer simulations now run without lack of memory, with fluid dynamics active or not. All tests still pass.

Documentation

No documentation change needed.

Miscellaneous (will be removed when merged)

Checklist (will be removed when merged)

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Code related list:

• All in-code documentation related to this PR is up to date (Doxygen format)
• Lethe documentation is up to date
• Fix has unit test(s) (preferred) or application test(s), and restart files are in the generator folder
• The branch is rebased onto master
• Changelog (CHANGELOG.md) is up to date
• Code is indented with indent-all and .prm files (examples and tests) with prm-indent

Pull request related list:

• Labels are applied
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• If the fix is temporary, an issue is opened
• The PR description is cleaned and ready for merge