Output original IDs in interactive.py (in case some rows are filtered; fixes #591)

Summary: Pull Request resolved: https://github.com/pytorch/fairseq/pull/606

Differential Revision: D14680968

Pulled By: myleott

fbshipit-source-id: 8044d828a8167199c10f2aee24f7e611feb91802

interactive.py

@@ -160,7 +160,7 @@ def main(args):
                     ))
 
         # update running id counter
-        start_id += len(results)
+        start_id += len(inputs)
 
 
 def cli_main():