Bug 33341: Address some perlcritic errors in 5.36

Bug 33341: Address some perlcritic errors in 5.36

Some old-style code is making our tests fail when run in Debian Testing.

This patch addresses this.

To test:
1. Launch bookworm KTD:
   $ KOHA_IMAGE=master-bookworm ktd up -d
2. Run:
   $ ktd --shell
  k$ prove t/00-testcritic.t
=> FAIL: It fails!
3. Apply the patch
4. Repeat 2
=> SUCCESS: Tests now pass!
5. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>