Fix first layer tool ordering in print-by-object mode (#6664)

Fix first layer tool ordering in print-by-object mode (SoftFever/OrcaSlicer#6615)

src/libslic3r/GCode/ToolOrdering.hpp

@@ -210,6 +210,7 @@ private:
     // All extruders, which extrude some material over m_layer_tools.
     std::vector<unsigned int>  m_all_printing_extruders;
     std::unordered_map<uint32_t, std::vector<uint8_t>> m_tool_order_cache;
+    const DynamicPrintConfig*  m_print_full_config = nullptr;
     const PrintConfig*         m_print_config_ptr = nullptr;
     const PrintObject*         m_print_object_ptr = nullptr;
     bool                       m_is_BBL_printer = false;