[train_text_to_image_sdxl]Add LANCZOS as default interpolation mode for image resizing

[ParagEkbote]

What does this PR do?

Refs #11390

As mentioned in the issue, I've updated LANCZOS as the default interpolation mode for the training script. Please let me know if any modifications are required and I will make the necessary changes.

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@asomoza

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[asomoza]

thanks, just a minor correction

[asomoza]

Suggested change

	train_resize = transforms.Resize(args.resolution,, interpolation=interpolation)
	train_resize = transforms.Resize(args.resolution, interpolation=interpolation)