Living: Despawn in endDeathAnimation()

this removes the necessity for the player to do this.

src/pocketmine/entity/Living.php

@@ -665,7 +665,7 @@ abstract class Living extends Entity implements Damageable{
 	}
 
 	protected function endDeathAnimation() : void{
-		//TODO
+		$this->despawnFromAll();
 	}
 
 	public function entityBaseTick(int $tickDiff = 1) : bool{