Fix consecutive constraint

[FBumann]

Description

Fix the formulation of a constraint. It's not really bug, as it doesn't inflict any problems.
Test need to be updated.

Type of Change

• Bug fix
• New feature
• Documentation update
• Code refactoring

Related Issues

Closes #(issue number)

Testing

• I have tested my changes
• Existing tests still pass

Checklist

• My code follows the project style
• I have updated documentation if needed
• I have added tests for new functionality (if applicable)

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/v3/fix-consecutive-constraint

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[FBumann]

The consecutive-duration constraints have since been rewritten (most recently in #729), so this 1-line reformulation no longer applies as-is.