FIX: fix bugs of calibration

Change-Id: I2d0f57105bdda2abc3fc7b218122d4df5a3161da

src/slic3r/GUI/DeviceManager.hpp

@@ -683,6 +683,7 @@ public:
     // 2: reset when start calibration in start page
     // 3: save tray_id, filament_id, setting_id, and name, nozzle_dia
     std::vector<CaliPresetInfo> selected_cali_preset;
+    float                      cache_flow_ratio { 0.0 };
 
     bool                       has_get_pa_calib_tab{ false };
     std::vector<PACalibResult> pa_calib_tab;