Make candidateQTvs contain tyvar with zonked kinds
candidateQTyVars was failing to return fully-zonked tyvars, and that made things fall over chaotically when we try to sort them into a well-scoped telescope. Result: Trac #15795 So I made candidateQTvs guarantee to have fully-zonked tyvars (i.e. with zonked kinds). That's a bit annoying but not really difficult.
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