Core/Scripts: dynamic_spawning follow-up, I had forgotten JustRespawned existed.

Port From (https://github.com/TrinityCore/TrinityCore/commit/129dd7c9091d3fafc0f5e10b795224bc9418d006)

Source/Scripts/Northrend/AzjolNerub/AzjolNerub/BossKrikthirTheGatewatcher.cs

@@ -131,9 +131,9 @@ namespace Scripts.Northrend.AzjolNerub.AzjolNerub.KrikthirTheGatewatcher
             SummonAdds();
         }
 
-        public override void JustRespawned()
+        public override void JustAppeared()
         {
-            base.JustRespawned();
+            base.JustAppeared();
             SummonAdds();
         }
 

Source/Scripts/Northrend/AzjolNerub/AzjolNerub/BossNadronox.cs

@@ -373,9 +373,9 @@ namespace Scripts.Northrend.AzjolNerub.AzjolNerub.Nadronox
                 Initialize();
         }
 
-        public override void JustRespawned()
+        public override void JustAppeared()
         {
-            base.JustRespawned();
+            base.JustAppeared();
             Initialize();
         }
 

Source/Scripts/Northrend/Ulduar/Mimiron.cs

@@ -486,7 +486,7 @@ namespace Scripts.Northrend.Ulduar
                 _events.ScheduleEvent(Events.Outtro1, 7000);
             }
 
-            public override void JustRespawned()
+            public override void JustAppeared()
             {
                 //SetupEncounter();
             }
@@ -922,7 +922,7 @@ namespace Scripts.Northrend.Ulduar
                 }
             }
 
-            public override void JustRespawned()
+            public override void JustAppeared()
             {
                 SetupEncounter();
             }