Fix monsters killed in town not being initialized,

resulting in garbage values after loading a saved game

src/scenario/town.hpp

@@ -101,7 +101,7 @@ private:
 	boost::dynamic_bitset<> item_taken;
 public:
 	bool can_find;
-	long m_killed;
+	long m_killed = 0;
 	
 	template<typename T>
 	void import_legacy(T& old, int town_num);