Set main_input_name in StableDiffusionSafetyChecker to "clip_input"

[clinty]

FlaxStableDiffusionSafetyChecker sets main_input_name to "clip_input". This makes StableDiffusionSafetyChecker consistent.

[pcuenca]

Hi @clinty! Thanks for the contribution. However, I'd like to understand what purpose it serves or how you expect this to be used. Unlike in the transformers codebase, main_input_name is not used in diffusers (except for some tests). Are you experiencing any shortcomings because it's not defined in StableDiffusionSafetyChecker?

[clinty]

@pcuenca only confusion on my part when I checked the value and found it to be input_ids and not one of the two valid inputs. I am not aware of any code which is using this.

[pcuenca]

Ah, it's set to a default value. In that case I'd support changing it to avoid confusion. I triggered a CI run, copying @sayakpaul as this affects the PyTorch implementation

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[clinty]

The test failure has the appearance of something transient.