Use enumerate to get index of ModuleList

[fullyz]

Tiny tweak.

torchscript doesn't support torch.nn.ModuleList indexing but does support enumeration.

cc @datumbox

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[NicolasHug]

Thanks @fullyz , this sounds good, provided that the tests are green.

I'll merge after the CI is finished (and after #4384!)

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[NicolasHug]

test failure was reported on #4506

Thanks @fullyz , LGTM. I'll merge when the CLA check has finished... probably after the major fb outage is resolved :s