binder_kind Generalized: remove 1st arg as it's always Implicit

https://coq.inria.fr/distrib/current/refman/language/gallina-extensions.html#implicit-generalization
>The generalizing binders `{ } and `( ) work similarly to their
>explicit counterparts, only binding the generalized variables
>implicitly, as maximally-inserted arguments.

I guess this was meant to provide a way to get "(A:_) {B:bla A}" from
"`{B:bla A}" (where A is generalizable) but there's no syntax for it
so let's drop the ml side until such a syntax exists.

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