remove static cast with undefined behavior

Author: arsnyder16

napi-inl.h

@@ -4583,11 +4583,10 @@ inline ObjectWrap<T>::ObjectWrap(const Napi::CallbackInfo& callbackInfo) {
   napi_value wrapper = callbackInfo.This();
   napi_status status;
   napi_ref ref;
-  T* instance = static_cast<T*>(this);
-  status = napi_wrap(env, wrapper, instance, FinalizeCallback, nullptr, &ref);
+  status = napi_wrap(env, wrapper, this, FinalizeCallback, nullptr, &ref);
   NAPI_THROW_IF_FAILED_VOID(env, status);
 
-  Reference<Object>* instanceRef = instance;
+  Reference<Object>* instanceRef = this;
   *instanceRef = Reference<Object>(env, ref);
 }