Remove duplicate area aura and housing session field declarations found by Windows PCH build

src/server/game/Server/WorldSession.h

@@ -3038,7 +3038,6 @@ public:
         ObjectGuid _lastCornerstoneGuid;
 
         // Client's last-used PlotIndex from OpenCornerstoneUI, cached for the subsequent BuyHouse CMSG.
-        uint32 _lastClientPlotIndex = 0;
 
         // Sliding window: HOUSING_DECOR_THROTTLE_BURST edits per HOUSING_DECOR_THROTTLE_WINDOW_MS.
         uint32 _housingDecorThrottleWindowStart = 0;

src/server/game/Spells/Spell.h

@@ -520,7 +520,6 @@ class TC_GAME_API Spell
         void EffectLearnSoulbindConduit();
 		void EffectCraftItem();
 		void EffectCraftLoot();
-        void EffectApplyAreaAura();
         void EffectRestoreGarrisonTroopVitality();
         void EffectLearnGarrisonSpecialization();
         void EffectCreateShipment();