message: Fixup widgetsnbextension enable command
diff: @@ -38,7 +38,7 @@ export JUPYTER_CONFIG_DIR={{IPYTHON_DIR}}/config
  export SHELL="/bin/bash"
  /sbin/setuser _mldb \
  - /usr/local/bin/jupyter nbextension enable --py --sys-prefix widgetsnbextension
  + /usr/local/bin/jupyter nbextension enable --py --log-level=WARN widgetsnbextension
  exec /sbin/setuser _mldb \
  /usr/local/bin/jupyter notebook \
  