Core/Auras: Use existing aura object on aura reapply/stack increase instead of creating a new one.

You can hook on reapply/stack event by checking for AURA_EFFECT_HANDLE_REAPPLY aura handler mode, AURA_EFFECT_HANDLE_REAL is now not triggered on aura refresh/stack.

src/server/scripts/Spells/spell_quest.cpp

@@ -668,7 +668,7 @@ public:
 
         void Register()
         {
-            AfterEffectApply += AuraEffectApplyFn(spell_q12851_going_bearback_AuraScript::HandleEffectApply, EFFECT_0, SPELL_AURA_PERIODIC_DUMMY, AURA_EFFECT_HANDLE_REAL);
+            AfterEffectApply += AuraEffectApplyFn(spell_q12851_going_bearback_AuraScript::HandleEffectApply, EFFECT_0, SPELL_AURA_PERIODIC_DUMMY, AURA_EFFECT_HANDLE_REAL_OR_REAPPLY_MASK);
         }
 
     };