implement returning full cost for buildings that get demolished in construction queue

src/lib/sim/BuildingSystem.cpp

@@ -263,7 +263,7 @@ int BuildingSystem::demolish(EntityId id)
             m_constructionQueue.erase(it);
             if (def)
             {
-                return def->cost * m_config.world.refundPercentage / 100;
+                return def->cost;
             }
             return 0;
         }