Bug 19646: (QA follow-up) Fix tab character

Bug 19646: (QA follow-up) Fix tab character

Resolve qa tools warning:
 FAIL   koha-tmpl/intranet-tmpl/prog/en/modules/cataloguing/value_builder/marc21_linking_section.tt
   FAIL   forbidden patterns
                forbidden pattern: tab char (line 172)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 58b6f1cd9e466c375526b01b801bb5de61e37706)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>