Make ClearBattleData virtual

src/Battling/Models/Creature.hpp

@@ -132,7 +132,7 @@ namespace CreatureLib::Battling {
         }
 
         void SetBattleData(const ArbUt::BorrowedPtr<Battle>& battle, const ArbUt::BorrowedPtr<BattleSide>& side);
-        void ClearBattleData() noexcept;
+        virtual void ClearBattleData() noexcept;
         inline const ArbUt::OptionalBorrowedPtr<Battle>& GetBattle() const { return _battleData.Battle; }
         inline const ArbUt::OptionalBorrowedPtr<BattleSide>& GetBattleSide() const { return _battleData.Side; }
         void SetOnBattleField(bool value);