Bug 19262: Remove xt/author/pod_spell.t

Bug 19262: Remove xt/author/pod_spell.t

If you run `prove xt/author/pod_spell.t` without having Test::Spelling installed, it will skip the tests.

If you install the lib-test-spelling-perl, the test will fail:
xt/author/pod_spell.t .. You said to run 0 tests at xt/author/pod_spell.t line 21.
xt/author/pod_spell.t .. Dubious, test returned 25 (wstat 6400, 0x1900)
No subtests run

This is because the call to all_pod_files_spelling_ok is expecting a path

If we try to fix it with adding "." as parameter, the tests will raise tone of errors.

Let's remove this file

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>