Precise Seam: remove known limitations and rework perimeter intersection (#16072)

Co-authored-by: Ian Bassi <ian.bassi@outlook.com>

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -5804,6 +5804,7 @@ void ObjectList::change_part_type()
   return;
 }
 #endif
+
 ModelVolumeType ObjectList::get_selected_volume_type()
 {
     ModelVolume* volume = get_selected_model_volume();