Remove duplicate code for downloading SD15_WEIGHTS

[marckohlbrugge]

I'm new to Cog and Python, so I could be wrong. But it seems like the download script is trying to download the SD15 weights twice.

Since it's cached, it doesn't impact performance. But it seems redundant.

multi-control/script/download_weights

Lines 36 to 39 in 12a5583

	p = StableDiffusionPipeline.from_pretrained(
	"runwayml/stable-diffusion-v1-5", torch_dtype=torch.float16, cache_dir=TMP_CACHE
	)
	p.save_pretrained(SD15_WEIGHTS)

multi-control/script/download_weights

Lines 60 to 61 in 12a5583

	pipe = StableDiffusionPipeline.from_pretrained("runwayml/stable-diffusion-v1-5", torch_dtype=torch.float16, cache_dir=TMP_CACHE)
	pipe.save_pretrained(SD15_WEIGHTS)