Fix the parameter in ParallelEmbedding

[taowangcheng]

The parameter passing is wrong in ParallelEmbedding. It should be the same as that in class VocabParallelEmbedding.

fairscale/fairscale/nn/model_parallel/layers.py

Line 111 in 164cc0f

self.max_norm = max_norm

This may be a typo error.

cc @ezyang @likethesky @myleott @froody @Celebio

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[awgu]

I think this is the same as #1132.