Fix xts failure for xml module

issue：https://gitee.com/openharmony/xts_acts/issues/I5T8LA
原因（目的、解决的问题等）
Fix xts failure for xml module

描述（做了什么，变更了什么）
Fix xts failure for xml module
Signed-off-by: N李_文强 <liwenqiang33@huawei.com>

commonlibrary/ets_utils/xml_lib_standard/src/main/js/test/xml.test.js

@@ -1097,7 +1097,7 @@ describe('XmlSerializerXmlPullParserTest', function () {
             '        </h:tr>' +
             '    </h:table>' +
             '</note>';
-        var arrayBuffer = new ArrayBuffer(strXml.length*2);
+        var arrayBuffer = new ArrayBuffer(strXml.length);
         var bufView = new Uint8Array(arrayBuffer);
         var strLen = strXml.length;
         for (var i = 0; i < strLen; ++i) {
@@ -1166,7 +1166,7 @@ describe('XmlSerializerXmlPullParserTest', function () {
             '        </h:tr>' +
             '    </h:table>' +
             '</note>';
-        var arrayBuffer = new ArrayBuffer(strXml.length*2);
+        var arrayBuffer = new ArrayBuffer(strXml.length);
         var bufView = new Uint8Array(arrayBuffer);
         var strLen = strXml.length;
         for (var i = 0; i < strLen; ++i) {
@@ -1232,7 +1232,7 @@ describe('XmlSerializerXmlPullParserTest', function () {
             '        </h:tr>' +
             '    </h:table>' +
             '</note>';
-        var arrayBuffer = new ArrayBuffer(strXml.length*2);
+        var arrayBuffer = new ArrayBuffer(strXml.length);
         var bufView = new Uint8Array(arrayBuffer);
         var strLen = strXml.length;
         for (var i = 0; i < strLen; ++i) {
@@ -1299,7 +1299,7 @@ describe('XmlSerializerXmlPullParserTest', function () {
             '        </h:tr>' +
             '    </h:table>' +
             '</note>';
-        var arrayBuffer = new ArrayBuffer(strXml.length*2);
+        var arrayBuffer = new ArrayBuffer(strXml.length);
         var bufView = new Uint8Array(arrayBuffer);
         var strLen = strXml.length;
         for (var i = 0; i < strLen; ++i) {
@@ -1343,7 +1343,7 @@ describe('XmlSerializerXmlPullParserTest', function () {
             '        </h:tr>' +
             '    </h:table>' +
             '</note>';
-        var arrayBuffer = new ArrayBuffer(strXml.length*2);
+        var arrayBuffer = new ArrayBuffer(strXml.length);
         var bufView = new Uint8Array(arrayBuffer);
         var strLen = strXml.length;
         for (var i = 0; i < strLen; ++i) {