[LoRA] Make optional arguments explicit
#5038
Merged
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What does this PR do?
As discussed offline, scale is an optional argument so we should pass it explcitily, this PR makes things compatible with PEFT together with huggingface/peft#933
cc @patrickvonplaten @sayakpaul
This should at least fix current issues with diffusers + PEFT for inference, for merge_and_unload we can investigate further