node-api: add missing initialization of last error

- Add missing initiatlization of last error which
  was reported by coverity.

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: #41290
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>

src/js_native_api_v8.h

@@ -56,6 +56,7 @@ struct napi_env__ {
       : isolate(context->GetIsolate()),
         context_persistent(isolate, context) {
     CHECK_EQ(isolate, context->GetIsolate());
+    napi_clear_last_error(this);
   }
   virtual ~napi_env__() {
     // First we must finalize those references that have `napi_finalizer`