Update init based on latest comfyui

[albertpurnama]

Error that I've found.

Traceback (most recent call last):
  File "/home/albert/Documents/dev/ComfyUI/ComfyUI-to-Python-Extension/comfyui_to_python.py", line 460, in <module>
    ComfyUItoPython(input_file=input_file, output_file=output_file, queue_size=queue_size)
  File "/home/albert/Documents/dev/ComfyUI/ComfyUI-to-Python-Extension/comfyui_to_python.py", line 425, in __init__
    self.execute()
  File "/home/albert/Documents/dev/ComfyUI/ComfyUI-to-Python-Extension/comfyui_to_python.py", line 434, in execute
    import_custom_nodes()
  File "/home/albert/Documents/dev/ComfyUI/ComfyUI-to-Python-Extension/utils.py", line 16, in import_custom_nodes
    from nodes import init_custom_nodes
ImportError: cannot import name 'init_custom_nodes' from 'nodes' (/home/albert/Documents/dev/ComfyUI/ComfyUI-to-Python-Extension/../nodes.py). Did you mean: 'init_extra_nodes'?

I think the import is old. This PR updates the import.

[albertpurnama]

May be duplicate of this #61

[kning]

would be great to get this merged, can confirm it works!

[pydn]

Thanks for your help here @albertpurnama!