package/python3-decorator: add _CPE_ID_VENDOR and _CPE_ID_PRODUCT

package/python3-decorator: add _CPE_ID_VENDOR and _CPE_ID_PRODUCT

cpe:2.3:a:python:decorator:* is a valid CPE identifier for this package:

 https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe:2.3:a:python:decorator

Note: 4783e5fd8c already added those for the python(2) variant.

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
[yann.morin.1998@free.fr:
  - add reference to 4783e5fd8c
  - move up, right after license
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>