SPIGOT-7911: Fix Location#isWorldLoaded() for re-loaded worlds

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/Location.java

@@ -82,7 +82,7 @@ public class Location implements Cloneable, ConfigurationSerializable {
         }
 
         World world = this.world.get();
-        return world != null && Bukkit.getWorld(world.getUID()) != null;
+        return world != null && world.equals(Bukkit.getWorld(world.getUID()));
     }
 
     /**