Follow-up of d07b3fb08b -> Show current bed shape for custom bed in bed shape dialog

src/slic3r/GUI/BedShapeDialog.cpp

@@ -234,7 +234,7 @@ void BedShapePanel::set_shape(ConfigOptionPoints* points)
 	// This is a custom bed shape, use the polygon provided.
 	m_shape_options_book->SetSelection(SHAPE_CUSTOM);
 	// Copy the polygon to the canvas, make a copy of the array.
-	m_canvas->m_bed_shape = points->values;
+    m_loaded_bed_shape = points->values;
     update_shape();
 }