Fixed a regression bug that spacing was not working anymore when arra…

…nge plate objects (#6741)

fix a regression bug in arrange

src/slic3r/GUI/Jobs/ArrangeJob.cpp

@@ -780,7 +780,7 @@ arrangement::ArrangeParams init_arrange_params(Plater *p)
  params.allow_multi_materials_on_same_plate = settings.allow_multi_materials_on_same_plate;
  params.avoid_extrusion_cali_region = settings.avoid_extrusion_cali_region;
  params.is_seq_print = settings.is_seq_print;
- params.min_obj_distance = settings.distance;
+ params.min_obj_distance = scaled(settings.distance);
  params.align_to_y_axis = settings.align_to_y_axis;
 
  int state = p->get_prepare_state();