mail/mailman3: Update rc.d script2026Q3

Fix the exit code of "service mailman status".  Mailman's own status
command exits 0 when it is not running and 1 when it is, which is the
inverse of the rc.subr convention.  Wrap it so that a running master
yields 0, as service(8) consumers such as Ansible expect.

Also add a start_precmd that detects an already running master via the
pidfile, so that "service mailman start" no longer dumps a full click
usage block on a second invocation.

PR:		292404
Sponsored by:	Netzkommune GmbH

(cherry picked from commit ae15f89980dff827563056d876641f942a70c6dd)

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