Spiral Matrix tests have expected and actual results swapped

[RainbowEncoder]

The Spiral Matrix tests report actual results as expected results and expected results as actual results. This makes the failure messages confusing at first glance as it appears that the tests are expecting the wrong result.

[github-actions]

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[BNAndras]

Related to https://forum.exercism.org/t/spiral-matrix-tests-have-expected-and-actual-results-swapped/17474

[BNAndras]

Fixed by #316