* Update train.py

Fix the bug of always the same W&B ID  and continue  overwrite with the old logging.
BUG report
https://github.com/ultralytics/yolov5/issues/1851

* Fix the bug of duplicate W&B ID

fix the bug of https://github.com/ultralytics/yolov5/issues/1851
If we had trained on yolov5s.pt, the program will generate a new unique W&B ID.
If we hadn't, the program will keep the old code, we can still use --resume aug.

* Update general.py

* revert train.py changes
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>