Fix filament combox disappearing (#8649)

Make sure frozen filament combox is thawed

src/slic3r/GUI/PresetComboBoxes.cpp

@@ -946,6 +946,7 @@ void PlaterPresetComboBox::update()
         selected_filament_preset = m_collection->find_preset(m_preset_bundle->filament_presets[m_filament_idx]);
         if (!selected_filament_preset) {
             //can not find this filament, should be caused by project embedded presets, will be updated later
+            Thaw();
             return;
         }
         //assert(selected_filament_preset);