fix: guidance_scale not work in sd

[hibobmaster]

Description
I use following config for stablediffusion

name: stablediffusion 
parameters:
  model: stabilityai/sdxl-turbo 
backend: diffusers
step: 1
cuda: false
# Force CPU usage - set to true for GPU
f16: false
diffusers:
  scheduler_type: euler_a
  cfg_scale: 1

When i used the image generation endpoint, i saw
stderr Keyword arguments {'guidance_scale': 1.0} are not expected by StableDiffusionXLPipeline and will be ignored.

According to the example provided by https://github.com/huggingface/diffusers/blob/90b9479903dcf3b053dc2461d4d6266eed0c27ea/docs/source/en/using-diffusers/sdxl.md?plain=1#L135
guidance_scale should not in xxxxxpipeline.from_pretrained or xxxxxpipeline.from_single_file parameters.

This PR fixes the problem mentioned above.

result:

before: after:

Notes for Reviewers

Feel free to edit or close the pr.

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[mudler]

thanks @hibobmaster !