chore(core): cleanup code p3 (#16073)

* Update MMapMgr.cpp

* Update UpdateFetcher.cpp

* Update AuctionHouseMgr.cpp

* Update AuctionHouseMgr.h

* Update BattlegroundAV.cpp

* Update ChannelMgr.cpp

* Update ThreatMgr.h

* Update Player.h

* Update PlayerSettings.cpp

* Update ObjectMgr.cpp

* Update Guild.cpp

* Update Guild.h

* Update Map.cpp

* Update World.cpp

* Update boss_nefarian.cpp

* Update boss_prince_malchezaar.cpp

* Update boss_venoxis.cpp

* Update zone_elwynn_forest.cpp

* Update zulfarrak.cpp

* Update boss_novos.cpp

src/server/game/Entities/Player/Player.h

@@ -1801,7 +1801,7 @@ public:
     {
         Unit::SetPvP(state);
         if (!m_Controlled.empty())
-            for (auto itr : m_Controlled)
+            for (auto& itr : m_Controlled)
                 itr->SetPvP(state);
     }
     void UpdatePvP(bool state, bool _override = false);