FIX: preset is incorrect when opening MW file

jira: STUDIO-9793
Change-Id: Ib1405c5badc4857a506ecea41ce4708eb2f83423
(cherry picked from commit e1d11d814ec0846fde047b54bfb2fadcd9303eec)

src/slic3r/GUI/PresetComboBoxes.hpp

@@ -78,6 +78,7 @@ public:
     int  get_filament_idx() const { return m_filament_idx; }
 
     std::string get_selected_dev_id() const { return m_selected_dev_id; }
+    void clear_selected_dev_id() { m_selected_dev_id.clear(); }
 
     // BBS
     wxString get_tooltip(const Preset& preset);