fix resize bug (#61166)

fix resize bug (#61166)

Summary:
I think the original intention here is to only take effect in the case of align_corners (because output_size = 1 and the divisor will be 0), but it affects non-align_corners too. For example:

```python
input = torch.tensor(
        np.arange(1, 5, dtype=np.int32).reshape((1, 1, 2, 2)) )
m = torch.nn.Upsample(scale_factor=0.5, mode="bilinear")
of_out = m(input)
```

The result we expect should be [[[[2.5]]]]

but pytorch get [[[[1.0]]]] which is different from OpenCV  and PIL, this pr try to fixed it。

Pull Request resolved: https://github.com/pytorch/pytorch/pull/61166

Reviewed By: malfet

Differential Revision: D30543178

Pulled By: heitorschueroff

fbshipit-source-id: 21a4035483981986b0ae4a401ef0efbc565ccaf1