argument miss in infer.py

[fengshi-cherish]

infer.py skips the first positional argument—format—when it calls model_demo / ACEStepPipeline.call.
This shifts every subsequent value one place left, so parameters land in the wrong slots and trigger type errors.

[craftmine1000]

this is untrue for infer.py as the usage of ACEStepPipeline.__call__() there is with keyword args,

this is true in infer-api.py however and is fixed by #239