Find the Entity from an Entity Reference

An EntityRef is different from an Entity. Fortunately, we have a handy method, get(), that will let us find the entity associated with a reference. 

1. In the moveChest function, find the else section that runs only once the chest’s moving up animation is finished. 
2. Create a new variable with let called chestLid
3. Set it to the entity by calling .get() on your chestLidRef variable.