Fix `Depth.encode_absolute`

[anhtu293]

General description of your pull request with the list of new features and/or bugs.

• Fix bug X : depth.encode_absolute has bug in dimension in torch1.13. #337
• How to fix: remove unsqueeze in encode_abosolute
• Result after fixing

  
  >>> from aloscene import Depth
  >>> import torch
  >>> depth = Depth(torch.zeros((1, 128, 128)), is_absolute=False)
  >>> depth.encode_absolute()
  tensor(
  scale=1
  shift=0
  distortion=1.0
  is_planar=True
  is_absolute=True
  projection=pinhole
  [[[100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       ...,
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.]]])
  >>> depth.encode_absolute(keep_negative=True)
  tensor(
  scale=1
  shift=0
  distortion=1.0
  is_planar=True
  is_absolute=True
  projection=pinhole
  [[[100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       ...,
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.],
       [100000000., 100000000., 100000000.,  ..., 100000000.,
        100000000., 100000000.]]])
  >>> 

_____
This pull request includes

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] This change requires a documentation update