Remove nType and nVersion from Zcash-specific code

src/hash.h

@@ -197,7 +197,7 @@ public:
     template<typename T>
     CBLAKE2bWriter& operator<<(const T& obj) {
         // Serialize to this stream
-        ::Serialize(*this, obj, nType, nVersion);
+        ::Serialize(*this, obj);
         return (*this);
     }
 };