fixup: fix Object toString test

Author: ljharb

test/built-ins/Object/prototype/toString/symbol-tag-non-str-builtin.js

@@ -26,7 +26,7 @@ var strIter = ''[Symbol.iterator]();
 var strIterProto = Object.getPrototypeOf(strIter);
 assert.sameValue(toString.call(strIter), '[object String Iterator]');
 delete strIterProto[Symbol.toStringTag];
-assert.sameValue(toString.call(strIter), '[object Object]');
+assert.sameValue(toString.call(strIter), '[object Iterator]');
 
 var arrIter = [][Symbol.iterator]();
 var arrIterProto = Object.getPrototypeOf(arrIter)