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Allow a naked type constructor in an existential type if
we are directly within a type application.
Recently, 84d4671 changed nested context creation to avoid passing
down the `TypeConstructorAllowed`, which led to missing kind errors
in code like `type T[({type M = List})#M]`.
However, when typechecking `T forSome { quantifiers }`, we create
a nested context to represent the nested scope introduced for the
quantifiers. But we need to propagate the `TypeConstructorAllowed`
bit to the nested context to allow for higher kinded existentials.
The enclosed tests show:
- pos/t9008 well kinded application of an hk existential
- neg/t9008 hk existential forbidden outside of type application
- neg/t9008b kind error reported for hk existential
Regressed in 84d4671.
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