Fix SVG & bitmap scaling on Mac depending on Retina scaling

src/slic3r/GUI/GUI_ObjectManipulation.cpp

@@ -92,7 +92,7 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
         else if (option_name == "Size") {
             line.near_label_widget = [this](wxWindow* parent) {
                 return new wxStaticBitmap(parent, wxID_ANY, wxNullBitmap, wxDefaultPosition,
-                                          create_scaled_bitmap("one_layer_lock_on.png").GetSize());
+                                          create_scaled_bitmap(m_parent, "one_layer_lock_on.png").GetSize());
             };
         }