Fixing the infill order for concentric infill to outside-in.

Relies to:
Concentric Fill Start Point - New Feature Request #4948
Feature Request: Archimedean Chords - Option to define direction of travel (Inside-Out or Outside-In) #5214

src/libslic3r/Print.cpp

@@ -1851,10 +1851,7 @@ void Print::_make_brim()
         }
         polygons_append(loops, offset(islands, -0.5f * float(flow.scaled_spacing())));
     }
-    loops = union_pt_chained(loops, false);
-    // The function above produces ordering well suited for concentric infill (from outside to inside).
-    // For Brim, the ordering should be reversed (from inside to outside).
-    std::reverse(loops.begin(), loops.end());
+    loops = union_pt_chained_outside_in(loops, false);
 
     // If there is a possibility that brim intersects skirt, go through loops and split those extrusions
     // The result is either the original Polygon or a list of Polylines