scopedSort and kind variable left-biasing

[Ryan Scott]

As Vlad notes in [1], getting rid of FreeKiTyVars isn't as simple as it
would appear, as we still treat kinds and types differently in other
places, such as data type declarations. For instance:

    data Proxy (a :: k) = Proxy -- k is brought into scope implicitly by
`extractDataDefnKindVars`

I don't know how to overcome this awkwardness, so if you have suggestions,
please comment at [1].

Ryan S.
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[1] https://gitlab.haskell.org/ghc/ghc/merge_requests/361#note_6709
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