[Enhancement] Delete seed in dist_train.sh (open-mmlab#1519)

Author: MeowZheng

tools/dist_train.sh

@@ -14,5 +14,4 @@ python -m torch.distributed.launch \
     --master_port=$PORT \
     $(dirname "$0")/train.py \
     $CONFIG \
-    --seed 0 \
     --launcher pytorch ${@:3}