www/gitlab: fix wrong detection of running Sidekiq

Sidekiq is detected as "not running" because when checking with "ps" it
does not account for column truncation

PR: 209487
Submitted by: Chris Stankevitz <chris-freebsd-bugs@stankevitz.com>
Reported by: otacilio.neto@bsd.com.br
Reviewed by: Matthias Fechner <idefix@fechner.net>