Object is not centered properly when tools are disabled.

[njourdane]

With the glass mode enabled (default), the object is shifted on the right for a better visualization of the tree.
But when tools option is set to false, there is no tree, and so the object appears not centered.

This bug is not present when glass mode is disabled.

Example:

import build123d as _
import ocp_vscode as ov

box = _.Box(3, 3, 1)
ov.show_object(box, tools=False, clear=True)

Displays: