Densenet 169 doesn't load the example.

[andimarafioti]

When I try to load the example with densenet 169 I get the following traceback:

`
python inflate_densenet.py --densenet_nb 169

Traceback (most recent call last):
File "/Users/andimarafioti/Documents/code/inflated_convnets_pytorch/inflate_densenet.py", line 113, in
run_inflater(args)
File "/Users/andimarafioti/Documents/code/inflated_convnets_pytorch/inflate_densenet.py", line 43, in run_inflater
i3densenet = I3DenseNet(
File "/Users/andimarafioti/Documents/code/inflated_convnets_pytorch/src/i3dense.py", line 15, in init
self.features, transition_nb = inflate_features(
File "/Users/andimarafioti/Documents/code/inflated_convnets_pytorch/src/i3dense.py", line 121, in inflate_features
_DenseLayer3d(
File "/Users/andimarafioti/Documents/code/inflated_convnets_pytorch/src/i3dense.py", line 53, in init
self.add_module('padding.1', pad_time)
File "/Users/andimarafioti/miniforge3/envs/torchless/lib/python3.9/site-packages/torch/nn/modules/module.py", line 380, in add_module
raise KeyError("module name can't contain ".", got: {}".format(name))
KeyError: 'module name can't contain ".", got: padding.1'
`

[andimarafioti]

According to pytorch/vision#809, "." are no longer allowed in module names.

Changing the "." to "-" fixes the issue.