Reformat expected lines in food-chain

[BNAndras]

The tests pane on the website wraps the expected list but reading it can be a bit difficult.

Here's an example from Arturo where each expected line starts at the same indent level as the others so it'd be easier to read.

[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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[no important files changed]

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