Removed OnQuestComplete hook, use QuestReward instead. Implemented OnQuestStatusChange hook

Also fixed some comments and added overrides
The OnQuestComplete hook was unused and didnt work properly

src/server/scripts/World/npcs_special.cpp

@@ -397,7 +397,7 @@ public:
         return true;
     }
 
-    bool OnQuestComplete(Player* /*player*/, Creature* creature, Quest const* quest) override
+    bool OnQuestReward(Player* /*player*/, Creature* creature, Quest const* quest, uint32 /*opt*/) override
     {
         if (quest->GetQuestId() == QUEST_CLUCK)
             ENSURE_AI(npc_chicken_cluck::npc_chicken_cluckAI, creature->AI())->Reset();