Fix Event Manager Allowing to Start Multiple Events of the Same Type …

…in a Short Time Window (DeltaV-Station#645)

# Description
Makes it so that the event scheduler doesn't pick events that were
already added (but not yet ended).

In order to fix this:

<details><p>


![image](https://github.com/user-attachments/assets/fd73dbce-7cbc-489b-8990-7ae791723351)

</p></details>

Content.Server/StationEvents/EventManagerSystem.cs

@@ -162,7 +162,7 @@ public TimeSpan TimeSinceLastEvent(EntityPrototype stationEvent)
 
     private bool CanRun(EntityPrototype prototype, StationEventComponent stationEvent, int playerCount, TimeSpan currentTime)
     {
-        if (GameTicker.IsGameRuleActive(prototype.ID))
+        if (GameTicker.IsGameRuleAdded(prototype.ID))
             return false;
 
         if (stationEvent.MaxOccurrences.HasValue && GetOccurrences(prototype) >= stationEvent.MaxOccurrences.Value)