FFT: disable dimension wrapping for scalar tensors (#89234)
Fixes #88985
By default, `maybe_wrap_dim` allows through `dim=0` or `dim=-1`
for scalar tensors which leads to an invalid dimension being used to
index into `tensor.sizes()` as in the code sample from the issue.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89234
Approved by: https://github.com/mruberry
