how to disable safty_checker in FlaxStableDiffusionPipeline

### Describe the bug

```
! python3 -m pip install -U tensorflow-cpu
import diffusers, os
pipeline = diffusers.StableDiffusionPipeline.from_single_file('https://huggingface.co/chaowenguo/pal/blob/main/chilloutMix-Ni.safetensors')
pipeline.save_pretrained('chilloutMix', safe_serialization=False)
pipeline, params = diffusers.FlaxStableDiffusionPipeline.from_pretrained('./chilloutMix', from_pt=True)
```
I always complains
```
Pipeline expected {'text_encoder', 'unet', 'scheduler', 'safety_checker', 'feature_extractor', 'vae', 'tokenizer'}, but only {'text_encoder', 'unet', 'scheduler', 'feature_extractor', 'vae', 'tokenizer'} were passed.
```
I want to know how to disable safety_checker in FlaxStableDiffusionPipeline
I try:
pipeline, params = diffusers.FlaxStableDiffusionPipeline.from_pretrained('./chilloutMix', from_pt=True, safety_checker=None)
Not working

### Reproduction

N/A

### Logs

_No response_

### System Info

kaggle tpu vm

### Who can help?

_No response_

Start with the reported FlaxStableDiffusionPipeline.from_pretrained call and compare the required components with those loaded from ./chilloutMix. Reproduce the missing safety_checker error using the issue's snippet; done means the documented or supported way to disable safety_checker works for this pipeline.

Scritto dal modello di indicizzazione a partire dal testo della issue.