optimize test generator

src/logic/scripting/lua/lua_custom_types.hpp

@@ -56,7 +56,7 @@ namespace lua {
             return TYPENAME;
         }
 
-        std::shared_ptr<Heightmap> getHeightmap() const {
+        const std::shared_ptr<Heightmap>& getHeightmap() const {
             return map;
         }
 

src/logic/scripting/scripting_world_generation.cpp

@@ -87,7 +87,6 @@ public:
                 for (int i = biomeParameters-1; i >= 0; i--) {
                     maps.push_back(
                         lua::touserdata<lua::LuaHeightmap>(L, -1-i)->getHeightmap());
-                    
                 }
                 lua::pop(L, 1+biomeParameters);
                 return maps;