Bug 26450: fix typo in plugin template

Bug 26450: fix typo in plugin template

The UNIMARC field 105 plugin template contains some dropdown menu
options with unnecessary capitalisation: "w - Religious text".

This patch fixes that.

Test plan: apply the patch, and confirm that the dropdown menu
options appear in all lowercase.

Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 17f307285f5d877806ac95fe64ce154be03948b6)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>