http2: use kEmptyObject

PR-URL: #43159
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: LiviaMedeiros

lib/internal/http2/core.js

@@ -37,7 +37,8 @@ const {
 const {
   assertCrypto,
   customInspectSymbol: kInspect,
-  promisify
+  kEmptyObject,
+  promisify,
 } = require('internal/util');
 
 assertCrypto();
@@ -3332,7 +3333,7 @@ function getPackedSettings(settings) {
   return binding.packSettings();
 }
 
-function getUnpackedSettings(buf, options = {}) {
+function getUnpackedSettings(buf, options = kEmptyObject) {
   if (!isArrayBufferView(buf) || buf.length === undefined) {
     throw new ERR_INVALID_ARG_TYPE('buf',
                                    ['Buffer', 'TypedArray'], buf);