CTransitionDatabase: Add virtual destructor

Prevents any undefined behavior from occurring through polymorphic
usage.

Runtime/Character/CTransitionDatabase.hpp

@@ -8,6 +8,7 @@ class IMetaTrans;
 
 class CTransitionDatabase {
 public:
+  virtual ~CTransitionDatabase() = default;
   virtual const std::shared_ptr<IMetaTrans>& GetMetaTrans(u32, u32) const = 0;
 };