fix weight_sd in lora_interrogator

[heyalexchoi]

Fixes error:

loading SD model: /home/alexchoi/checkpoints/abc.safetensors
loading u-net: <All keys matched successfully>
loading vae: <All keys matched successfully>
loading text encoder: <All keys matched successfully>
loading LoRA: /home/alexchoi/stable-diffusion-webui/models/Lora/abc-000100.safetensors
create LoRA network from weights
create LoRA for Text Encoder: 72 modules.
create LoRA for U-Net: 192 modules.
Traceback (most recent call last):
  File "/home/alexchoi/kohya-sd-scripts-clone/./networks/lora_interrogator.py", line 128, in <module>
    interrogate(args)
  File "/home/alexchoi/kohya-sd-scripts-clone/./networks/lora_interrogator.py", line 28, in interrogate
    for key in network.weights_sd.keys():
AttributeError: 'tuple' object has no attribute 'weights_sd'
Traceback (most recent call last):
  File "/home/alexchoi/anaconda3/envs/sd-scripts/bin/accelerate", line 8, in <module>
    sys.exit(main())
  File "/home/alexchoi/anaconda3/envs/sd-scripts/lib/python3.10/site-packages/accelerate/commands/accelerate_cli.py", line 45, in main
    args.func(args)
  File "/home/alexchoi/anaconda3/envs/sd-scripts/lib/python3.10/site-packages/accelerate/commands/launch.py", line 1104, in launch_command
    simple_launcher(args)
  File "/home/alexchoi/anaconda3/envs/sd-scripts/lib/python3.10/site-packages/accelerate/commands/launch.py", line 567, in simple_launcher
    raise subprocess.CalledProcessError(returncode=process.returncode, cmd=cmd)
subprocess.CalledProcessError: Command '['/home/alexchoi/anaconda3/envs/sd-scripts/bin/python', './networks/lora_interrogator.py', '--sd_model=/home/alexchoi/checkpoints/abc.safetensors', '--model=/home/alexchoi/stable-diffusion-webui/models/Lora/abc-000100.safetensors']' returned non-zero exit status 1.

[kohya-ss]

Thank you for this! I've merged #392, this is because that PR was submitted first. I hope you understand.