fix buggy test

Author: syz99

test/node/extended_json_tests.js

@@ -227,7 +227,7 @@ describe('Extended JSON', function () {
       binary: new Binary(''),
       code: new Code('function() {}'),
       dbRef: new DBRef('tests', new Int32(1), 'test'),
-      decimal128: new Decimal128(128),
+      decimal128: new Decimal128('128'),
       double: new Double(10.1),
       int32: new Int32(10),
       long: new Long(234),
@@ -248,7 +248,7 @@ describe('Extended JSON', function () {
       binary: { $binary: { base64: '', subType: '00' } },
       code: { $code: 'function() {}' },
       dbRef: { $ref: 'tests', $id: { $numberInt: '1' }, $db: 'test' },
-      decimal128: { $numberDecimal: '0E-6176' },
+      decimal128: { $numberDecimal: '128' },
       double: { $numberDouble: '10.1' },
       int32: { $numberInt: '10' },
       long: { $numberLong: '234' },