fix frontends.torch.{h,v,d}split

[xoiga123]

Apparently, unlike what the docs state:

torch.hsplit(input, indices_or_sections) → List of Tensors

these calls are all valid:

a = torch.tensor([1, 2])
torch.hsplit(a, 1)
torch.hsplit(a, indices=[1])
torch.hsplit(a, sections=1)

[Infrared1029]

Good catch! @xoiga123, left two comments, after that we should be good to merge:)

[Infrared1029]

if not ivy.exists(indices_or_sections): is probably even better, I updated the previous comment but was too late it seems, sorry for that, we can merge after this little tweak:)

[Infrared1029]

lgtm, thanks for your contribution to ivy:)