Bug 23700: Fix output of koha-plack --restart

Bug 23700: Fix output of koha-plack --restart

To test:
- Run "sudo koha-plack restart kohadev" and verify the output is
  out of line.
- Apply the patch
- If you are on e.g. kohadevbox you need to copy koha-plack to
  /usr/sbin/ thus:
  sudo cp debian/scripts/koha-plack /usr/sbin/koha-plack
- Run "sudo koha-plack restart kohadev" again and check that you
  get two lines of output, nicely aligned with the "OK" inside the
  square brackets.

Signed-off-by: Jesse Maseto <jesse@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>