Fix #129448: Undoing face set changes produces artifacts on dense mesh

Introduced in 60ab232afb

An incorrect subset of nodes was calculated as the code prior to this
commit was inspecting vertex indices instead of face indices.

Pull Request: https://projects.blender.org/blender/blender/pulls/129487

source/blender/editors/sculpt_paint/sculpt_undo.cc

@@ -987,7 +987,7 @@ static void restore_list(bContext *C, Depsgraph *depsgraph, StepData &step_data)
         MutableSpan<bke::pbvh::MeshNode> nodes = pbvh.nodes<bke::pbvh::MeshNode>();
         const IndexMask changed_nodes = IndexMask::from_predicate(
             node_mask, GrainSize(1), memory, [&](const int i) {
-              return indices_contain_true(modified_faces, nodes[i].all_verts());
+              return indices_contain_true(modified_faces, nodes[i].faces());
             });
         pbvh.tag_face_sets_changed(changed_nodes);
       }