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Set self._hf_peft_config_loaded to True when LoRA is loaded using `load_lora_adapter` in PeftAdapterMixin class (#11155)

set self._hf_peft_config_loaded to True on successful lora load

Sets the `_hf_peft_config_loaded` flag if a LoRA is successfully loaded in `load_lora_adapter`. Fixes bug huggingface/diffusers/issues/11148
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>