"python beam 1@0": bad universe index

[ChristopherMayes]

This Tao>python command was changed recently, but it doesn't work:

In bmad-doc/tao_examples/optics_matching:

Tao> beamon

Tao> python beam 1@0
[FATAL | 2024-JUN-24 19:28:10] tao_pointer_to_universe_int:
    UNIVERSE INDEX OUT OF RANGE: -999
[ERROR | 2024-JUN-24 19:28:10] tao_python_cmd:
    "python beam 1@0": bad universe index
INVALID

[DavidSagan]

Fixed.