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/database/Updater/UpdateFetcher.cpp

@@ -252,7 +252,7 @@ UpdateResult UpdateFetcher::Update(bool const redundancyChecks,
 
     // Fill hash to name cache
     HashToFileNameStorage hashToName;
-    for (auto entry : applied)
+    for (auto& entry : applied)
         hashToName.insert(std::make_pair(entry.second.hash, entry.first));
 
     size_t importedUpdates = 0;