Fix invalid file path

[yjhtry]

[github-actions]

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[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

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[senekor]

Thanks, that's a regression from 88c13fb.

Did you test that this is enough? I also see a file macros/tests/invalid/Cargo.toml with the old file names, is that not causing trouble?

[senekor]

Yeah the tests are just "passing" because all of the invalid examples are failing to compile unconditionally.

[senekor]

I pushed a version where the invalid tests actually do their job here