LinkedHashMap method deleteAt

[zrwusa]

To Reproduce
Steps to reproduce the behavior:
let hashMap: LinkedHashMap<string, number>;

 hashMap.set('one', 1);
  hashMap.set('two', 2);

  hashMap.delete('one');
  expect(hashMap.get('one')).toBeUndefined();
  expect(hashMap.size).toBe(1);
  hashMap.deleteAt(0);
  expect(hashMap.get('two')).toBe(undefined); // different from expected
  expect(hashMap.size).toBe(0);