Bug 14543: (QA follow-up) Add missing filter

Bug 14543: (QA follow-up) Add missing filter

This patch adds a missing `| html` filter to the tax_rate value option
that the patchset adds

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 369a4e39b48456be4376292f724a787ef0b6667e)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit c5c345ed94cc5c1a0e31af03c26dc0c2190c38de)

Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>