sorbet/files.yaml: Merge the two false lists into one

[issyl0]

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• I've been asked a couple of times now what the two different false: lists mean. And the answer is "nothing". So to avoid confusion (and to stop my YAML linter moaning about duplicate keys), merge the two lists and re-alphabetize.

[reitermarkus]

Thanks @issyl0, I just noticed this and was also wondering why false is in there twice.