Replaced use of copy.deepcopy()

[JoseLuisC99]

Fixes #2331

Description

Replaces use of copy.deepcopy() in Convolution/Batch Norm Fuser tutorial.

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[kit1980]

This doesn't make sense to me.
torch.load accepts a file, not a dict.

Please verify the code before submitting.

[kit1980]

And looking closer, I think the deepcopy is fine there, no need to change really.

[JoseLuisC99]

I'm so sorry, it's more correct to use load_state_dict instead of load as mentioned in Deep copying PyTorch modules.