www/py-django-recaptcha: Fix stage QA issues

• Fix poudriere bulk -t by partially restoring removed PKGNAMEPREFIX from fd2ba60b94f9:

[...]

> Running Q/A tests (stage-qa)

Error: Package names are not unique with flavors:
py311: django-recaptcha-4.1.0
py312: django-recaptcha-4.1.0
py313: django-recaptcha-4.1.0
py313t: django-recaptcha-4.1.0
py314: django-recaptcha-4.1.0
py310: django-recaptcha-4.1.0
Error: maybe use <flavor>_PKGNAMEPREFIX/SUFFIX.
[...]

Approved by: portmgr (build fix blanket)
Fixes: fd2ba60b94f9 www/py-django-recaptcha: Update to 4.0.0