Add virtual destructor to CreatureParty.

src/Battling/Models/CreatureParty.hpp

@@ -12,7 +12,7 @@ namespace CreatureLib::Battling {
         CreatureParty(std::vector<Creature*> party) : _party(party) {}
         CreatureParty(std::initializer_list<Creature*> party) : _party(party) {}
 
-        ~CreatureParty() {
+        virtual ~CreatureParty() {
             for (auto c : _party) {
                 delete c;
             }