Scripts/Ulduar: Fixed Sanctum Sentry accumulating events after wipes

(cherry picked from commit 266a9c3d41d238f5176942ffdfc5c4adfe7e564a)

src/server/scripts/Northrend/Ulduar/Ulduar/boss_auriaya.cpp

@@ -284,6 +284,7 @@ struct npc_sanctum_sentry : public ScriptedAI
 
     void Reset() override
     {
+        _events.Reset();
         DoCastSelf(SPELL_STRENGHT_OF_THE_PACK, true);
         me->SetWalk(true);
     }