Genie startup

[danielmaclaren]

Pyright checks returned one error:

c:\Instrument\Dev\genie\src\genie_python\genie_startup.py
c:\Instrument\Dev\genie\src\genie_python\genie_startup.py:26:16 - error: Argument of type "None" cannot be assigned to parameter "pv_prefix" of type "str"
  "None" is not assignable to "str" (reportArgumentType)
1 error, 0 warnings, 0 informations

This was the line it refered to:

# Call set_instrument with None to force it to try to guess the instrument set_instrument(None) # noqa F405 (defined from star import)

This is the change I made to genie.py

def set_instrument(pv_prefix: str | None, import_instrument_init: bool = True) -> None:

Allowed 'None' to be a pv_prefix

Please let me know if there was a better way to fix the pyright error!