Scripts/ToTC: Correcting Jaraxxus Volcano and Nether Portal behaviour

Closes #7687
Closes #7467

src/server/scripts/Northrend/CrusadersColiseum/TrialOfTheCrusader/boss_lord_jaraxxus.cpp

@@ -329,6 +329,8 @@ public:
             // used to despawn corpse immediately
             me->DespawnOrUnsummon();
         }
+
+        void UpdateAI(uint32 const diff) {}
     };
 
 };
@@ -438,6 +440,8 @@ public:
             // used to despawn corpse immediately
             me->DespawnOrUnsummon();
         }
+
+        void UpdateAI(uint32 const diff) {}
     };
 
 };