Revert "php-fpm: allow only one pid file"
This reverts commit 64ae8656.
On Debian (unstable), the PID file is stored with the 7.4 version:
/run/php/php-fpm.sock /run/php/php7.4-fpm.pid /run/php/php7.4-fpm.sock
Fixes: #115 (closed) Reported-by: Antonio Russo <www.antonioerusso.com> MR: