Memory leak risk in Tween.destroy

[atox996]

In the destroy() method of Konva.Tween, only the keys inside Tween.tweens[nodeId] are deleted, but nodeId itself is not fully removed from Tween.tweens, which may lead to memory leaks. Similarly, Tween.attrs[nodeId][thisId] is deleted, but Tween.attrs[nodeId] may still remain in memory.