Undo marking tests that don't need it as standalone

[awaelchli]

What does this PR do?

The https://github.com/Lightning-AI/lightning/pull/15105/files#r1004923337 was missed.

cc @Borda @Borda @justusschock

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[carmocca]

Until we fix the tests added with #15309 or we merge #15347, this is blocked