Fix missing parenthesis in folding

[fxmarty]

These missing parenthesis may be somewhere else as well.

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[btgraham]

Re: https://pytorch.org/docs/stable/generated/torch.nn.BatchNorm1d.html#torch.nn.BatchNorm1d
Are parenthesis really missing on L122? If the input and bn.running_mean are exactly zero, I think the output of the combined 'Linear+BatchNorm' operation should be exactly equal to bn.bias. So I don't think we should dividebn.bias by (bn.running_var + bn.eps)**0.5 when forming m??

[fxmarty]

@btgraham Right, I misread, my bad!