ENH: enable arachne for wall

Refer to prusa and enable arachne for wall.

Arachne also has corner case and cause strange
slicing result and bad quality when print, while
class engine is much better for these cases.

Provide option for user to choose.

Signed-off-by: salt.wei <salt.wei@bambulab.com>
Change-Id: Ieb3a1c6a457ca610561f8734de4a122d74165afd

src/libslic3r/PrintObject.cpp

@@ -827,6 +827,15 @@ bool PrintObject::invalidate_state_by_config_options(
             	steps.emplace_back(posInfill);
 	            steps.emplace_back(posSupportMaterial);
 	        }
+        } else if (
+                opt_key == "wall_generator"
+            || opt_key == "wall_transition_length"
+            || opt_key == "wall_transition_filter_deviation"
+            || opt_key == "wall_transition_angle"
+            || opt_key == "wall_distribution_count"
+            || opt_key == "min_feature_size"
+            || opt_key == "min_bead_width") {
+            steps.emplace_back(posSlice);
         } else if (
                opt_key == "seam_position"
             || opt_key == "support_speed"