Bug 34569: Fix misc/cronjobs/holds/holds_reminder.pl trigger arg

Bug 34569: Fix misc/cronjobs/holds/holds_reminder.pl trigger arg

misc/cronjobs/holds/holds_reminder.pl help says one can use arge -t for --triggered
But not implemented in code.
Should be like in misc/cronjobs/overdue_notices.pl :
  't|triggered'    => \$triggered,

Test plan :
Play with misc/cronjobs/holds/holds_reminder.pl with arg -t and
--trigger

Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>