Cleanup: Sculpt: Resolve todo about const in auto-masking argument

It turns out the undo push is unrelated to this though.

source/blender/editors/sculpt_paint/mesh_brush_common.hh

@@ -94,13 +94,8 @@ namespace auto_mask {
 
 /**
  * Calculate all auto-masking influence on each vertex.
- *
- * \todo Remove call to `undo::push_node` deep inside this function so the `object` argument can be
- * const. That may (hopefully) require pulling out the undo node push into the code for each brush.
- * That should help clarify the code path for brushes, and various optimizations will depend on
- * brush implementations doing their own undo pushes.
  */
-void calc_vert_factors(Object &object,
+void calc_vert_factors(const Object &object,
                        const Cache &cache,
                        const PBVHNode &node,
                        Span<int> verts,

source/blender/editors/sculpt_paint/sculpt.cc

@@ -1208,7 +1208,7 @@ void SCULPT_orig_vert_data_unode_init(SculptOrigVertData &data,
 }
 
 void SCULPT_orig_vert_data_init(SculptOrigVertData &data,
-                                Object &ob,
+                                const Object &ob,
                                 const PBVHNode &node,
                                 const blender::ed::sculpt_paint::undo::Type type)
 {

source/blender/editors/sculpt_paint/sculpt_automasking.cc

@@ -594,7 +594,7 @@ static void mesh_orig_vert_data_update(SculptOrigVertData &orig_data, const int
   orig_data.no = orig_data.normals[vert];
 }
 
-void calc_vert_factors(Object &object,
+void calc_vert_factors(const Object &object,
                        const Cache &cache,
                        const PBVHNode &node,
                        const Span<int> verts,
@@ -612,7 +612,7 @@ void calc_vert_factors(Object &object,
   }
 }
 
-NodeData node_begin(Object &object, const Cache *automasking, const PBVHNode &node)
+NodeData node_begin(const Object &object, const Cache *automasking, const PBVHNode &node)
 {
   if (!automasking) {
     return {};

source/blender/editors/sculpt_paint/sculpt_intern.hh

@@ -1007,7 +1007,7 @@ Set<int> gather_hidden_face_sets(Span<bool> hide_poly, Span<int> face_sets);
  * handles #BMesh, #Mesh, and multi-resolution.
  */
 void SCULPT_orig_vert_data_init(SculptOrigVertData &data,
-                                Object &ob,
+                                const Object &ob,
                                 const PBVHNode &node,
                                 blender::ed::sculpt_paint::undo::Type type);
 /**
@@ -1337,7 +1337,7 @@ struct NodeData {
 /**
  * Call before PBVH vertex iteration.
  */
-NodeData node_begin(Object &object, const Cache *automasking, const PBVHNode &node);
+NodeData node_begin(const Object &object, const Cache *automasking, const PBVHNode &node);
 
 /* Call before factor_get and SCULPT_brush_strength_factor. */
 void node_update(NodeData &automask_data, const PBVHVertexIter &vd);