Use WorldServer#entitesById for entity iteration

WorldServer#globalEntityList is not the actual list of entities in a world

Spigot-Server-Patches/Add-MinecraftKey-Information-to-Objects.patch

@@ -6,12 +6,12 @@ Subject: [PATCH] Add MinecraftKey Information to Objects
 Stores the reference to the objects respective MinecraftKey
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
-index 841edd010f..3354fdd60d 100644
+index b5f318c00d..ce190d88d6 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperCommand.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
 @@ -0,0 +0,0 @@ public class PaperCommand extends Command {
  
-                 List<Entity> entities = world.globalEntityList;
+                 Collection<Entity> entities = world.entitiesById.values();
                  entities.forEach(e -> {
 -                    MinecraftKey key = new MinecraftKey(""); // TODO: update in next patch
 +                    MinecraftKey key = e.getMinecraftKey();