Avoid unnecessary GGUF model unloading after patches

[google-labs-jules]

Implemented logic in GGUFModelPatcher.unpatch_model to check src.Device.current_loaded_models. If the model is not in the list (meaning it was popped for reload/repatch), the method ignores the device_to argument if it points to the offload device, thus preserving the weights on the current device (GPU). This avoids the expensive GPU->CPU transfer when simply changing LoRAs or patches.

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PR created automatically by Jules for task 7709232856346694567 started by @Aatricks

[google-labs-jules]

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