[egs] minor fix in fisher_swbd/s5/local/chain/run_blstm_6h.sh (#1320)

Author: stanleyguan

egs/fisher_swbd/s5/local/chain/run_blstm_6h.sh

@@ -107,8 +107,6 @@ if [ $stage -le 13 ]; then
  /export/b0{5,6,7,8}/$USER/kaldi-data/egs/fisher_swbd-$(date +'%m_%d_%H_%M')/s5c/$dir/egs/storage $dir/egs/storage
  fi
 
- touch $dir/egs/.nodelete # keep egs around when that run dies.
-
  steps/nnet3/chain/train.py --stage $train_stage \
  --cmd "$decode_cmd" \
  --feat.online-ivector-dir exp/nnet3/ivectors_${train_set} \