mail/sympa: fix bugs in rc.d script

• Current sympa.rc not show the correct status, always active. grep with pid string also process.
• The output of ps depends on the windows size. Sometime truncated /usr/local/libexec/sympa/task_manager.pl -w for avoid it.
• Change ps options to BSD-sytle.

PR: 199145
Submitted by: Igor Zabelin <igorz@yandex.ru>
Approved by: geoffroy desvernay <dgeo@centrale-marseille.fr> (maintainer)