bug fix for scorer config
bug fix for scorer config

Summary:
bug fix for scorer config
- additional scorer arguments (e.g. WER punctuation removal) from cli are not passed into `build_scorer` properly

Reviewed By: jmp84

Differential Revision: D25797236

fbshipit-source-id: 909e272931ca0fd1cad2d7d8a2ca7e79bd7dcd43

pytorch/fairseq,pytorch/fairseq,pytorch/fairseq