Fix implementation of float64 in torch_utils #16058
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Description
Implementation of float64 in torch_utils added in #15815 does not work as intended.
I was getting errors while testing PLMS, DDIM, DDIM CFG++ on my M3 Pro Mac.
TypeError: Cannot convert a MPS Tensor to float64 dtype as the MPS framework doesn't support float64. Please use float32 instead.
This is fixed implementation of float64, which now works as it was intended.
Screenshots/videos:
Checklist: