From the user perspective, the transform tools in editmode and
sculptmode look like the same tools, the equal behavior could be
expected.
So now set vertices on the mirror axis (check with the same epsilon as
editmode transform) while transforming, replicating what
`mesh_transdata_mirror_apply` does.
Pull Request: https://projects.blender.org/blender/blender/pulls/123428
5a8003091c