Fix AttributeError in train_lcm_distill_lora_sdxl_wds.py

[jainalphin]

What does this PR do?

This pull request fixes an AttributeError in train_lcm_distill_lora_sdxl_wds.py by updating the code to use args.pretrained_teacher_model instead of args.pretrained_model_name_or_path.

This fix resolves the error:

  File "/diffusers/examples/consistency_distillation/train_lcm_distill_lora_sdxl_wds.py", line 1530, in <module>
    main(args)
  File "/diffusers/examples/consistency_distillation/train_lcm_distill_lora_sdxl_wds.py", line 1361, in main
    if torch.backends.mps.is_available() or "playground" in args.pretrained_model_name_or_path:
AttributeError: 'Namespace' object has no attribute 'pretrained_model_name_or_path'. Did you mean: 'pretrained_vae_model_name_or_path'?

Before submitting

• [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline?

Who can review?

• Training examples: @sayakpaul

[HuggingFaceDocBuilderDev]

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