Fix EvtExperienceSpawn firing more than once (#2751)

* EvtExperienceSpawn - fix event firing more than once

* EvtExperienceSpawn - fix line endings

Co-authored-by: bensku <bmi@iki.fi>

src/main/java/ch/njol/skript/events/EvtExperienceSpawn.java

@@ -92,6 +92,7 @@ private static void registerExecutor() {
 			return;
 		for (final Class<? extends Event> c : new Class[] {BlockExpEvent.class, EntityDeathEvent.class, ExpBottleEvent.class, PlayerFishEvent.class})
 			Bukkit.getPluginManager().registerEvent(c, new Listener() {}, SkriptConfig.defaultEventPriority.value(), executor, Skript.getInstance(), true);
+		registeredExecutor = true;
 	}
 
 	private final static EventExecutor executor = new EventExecutor() {