Fix bool in schema bug

[jordlay]

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[Cyclam]

I've reverted the change that separated the processing of oneOf and anyOf errors. I think the motivation was to provide the user with a more tailored error message, but in this case, I think the existing message was still pretty clear, and it gave the user the chance to clear up multiple issues with their file, rather than having to run again to get the further advice.

Anyway, it's not part of the bug fix, so arguably should be in a different PR anyway :-)