Swap actual and expected values in tests

[pfertyk]

This is a follow-up for exercism/gdscript-test-runner#18.

@glaxxie @BNAndras as main contributors, could you please take a look? ;)

[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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[BNAndras]

Unrelated to this PR, but roughly_equal doesn't seem ergonomic here. The student is expecting two floats to be compared, but the test runner sees these as booleans. So if you fail test_age_on_Earth and the test runner says something like false isn't true, that might be confusing compared to returning "31.68 is not 31.69". That intuitively makes more sense to me so perhaps roughly_equal can log the two values being compared when the comparison is false.

[pfertyk]

Good point, thanks! I will create a new GitHub issue for this. Perhaps Godot has some rounding methods that we could use here ;)