Update fresh-iterator-result.js

See tc39/proposal-iterator-sequencing#18 (comment)

Author: michaelficarra

test/built-ins/Iterator/concat/fresh-iterator-result.js

@@ -46,4 +46,4 @@ let iterResult = iterator.next();
 assert.sameValue(iterResult.done, false);
 assert.sameValue(iterResult.value, 123);
 
-assert.notSameValue(iterResult, oldIterResult);
+assert.sameValue(iterResult, oldIterResult);