renamed spawnpoint key name

src/main/java/eu/mhsl/craftattack/spawn/appliances/spawnpoint/Spawnpoint.java

@@ -16,7 +16,7 @@ import java.util.Locale;
 
 public class Spawnpoint extends Appliance {
     private static final String namespace = Spawnpoint.class.getSimpleName().toLowerCase(Locale.ROOT);
-    public static NamespacedKey alreadySpawned = new NamespacedKey(namespace, "editable");
+    public static NamespacedKey alreadySpawned = new NamespacedKey(namespace, "alreadySpawned".toLowerCase());
     private static final String position = "position";
 
     private Location spawnPoint;