sysutils/py-ansible-*: Fix DATADIR for Ansible plugins

All the Ansible plugins assume that the Ansible DATADIR is
${PREFIX}/share/${PYTHON_PKGNAMEPREFIX}ansible instead of
${PREFIX}/share/${PYTHON_PKGNAMEPREFIX}ansible-base or
${PREFIX}/share/${PYTHON_PKGNAMEPREFIX}ansible-core.

This patch sets the DATADIR back to its historical value. It's based on
a patch provided by madpilot.

PR: 255920
Reported by: madpilot