Core/Objects: Removed type casts before accessing WorldObject::m_Events that became unneccessary after moving it from Unit to WorldObject

Port From (https://github.com/TrinityCore/TrinityCore/commit/bc8874f30597a996eb30b7b278bcc71b2f082f10)

Source/Game/Entities/TemporarySummon.cs

@@ -321,9 +321,7 @@ namespace Game.Entities
         {
             if (msTime != 0)
             {
-                ForcedUnsummonDelayEvent pEvent = new(this);
-
-                m_Events.AddEvent(pEvent, m_Events.CalculateTime(TimeSpan.FromMilliseconds(msTime)));
+                m_Events.AddEventAtOffset(new ForcedDespawnDelayEvent(this), TimeSpan.FromMilliseconds(msTime));
                 return;
             }
 
@@ -1215,21 +1213,6 @@ namespace Game.Entities
         }
     }
 
-    public class ForcedUnsummonDelayEvent : BasicEvent
-    {
-        public ForcedUnsummonDelayEvent(TempSummon owner)
-        {
-            m_owner = owner;
-        }
-        public override bool Execute(ulong e_time, uint p_time)
-        {
-            m_owner.UnSummon();
-            return true;
-        }
-
-        TempSummon m_owner;
-    }
-
     public class TempSummonData
     {
         public uint entry;        // Entry of summoned creature

Source/Game/Entities/Totem.cs

@@ -91,7 +91,7 @@ namespace Game.Entities
         {
             if (msTime != 0)
             {
-                m_Events.AddEvent(new ForcedUnsummonDelayEvent(this), m_Events.CalculateTime(TimeSpan.FromMilliseconds(msTime)));
+                m_Events.AddEventAtOffset(new ForcedDespawnDelayEvent(this), TimeSpan.FromMilliseconds(msTime));
                 return;
             }