stop blacklisting Wrapper and illegal code is generated

[fitzgen]

Input adapted from double_replaces.hpp by removing the --blacklist-type Wrapper flag:

// bindgen-flags: -- --std=c++11

namespace JS {

namespace detail {

template<typename T>
struct Wrapper {
    struct Wrapped {
        T t;
    };
    using Type = Wrapped;
};

template <typename T>
using MaybeWrapped = typename Wrapper<T>::Type;

}

template<typename T>
class Rooted {
    detail::MaybeWrapped<T> ptr;
};

}

/**
 * <div rustbindgen replaces="MaybeWrapped"></div>
 */
template <typename T>
using replacement_MaybeWrapped = T;

Generated type definition for Wrapper_Wrapped is missing the template parameter:

error[E0412]: type name `T` is undefined or not in scope
  --> tests/expectations/replaces_double_from_outside.rs:18:41
   |
18 | pub type Wrapper_Type = Wrapper_Wrapped<T>;
   |                                         ^ undefined or not in scope
   |
   = help: no candidates by the name of `T` found in your project; maybe you misspelled the name or forgot to import an external crate?

error: aborting due to previous error

[emilio]

Patch (now in #85): emilio@6484e3e

[emilio]

#85 landed.