base: make python3 barcode look similar to python2 barcodes

The library for python3 has differents, try to adjust it a bit.
2 jobs for zope4py3 in 0 seconds
Status Job ID Name Coverage
  External
failed ERP5.UnitTest-Zope4Py3-jerome

01:11:34

failed ERP5.UnitTest-Zope4Py3-py2-jerome

01:28:55