Bug 20793: (follow-up) Add style to the non-link hold count on detail page

Bug 20793: (follow-up) Add style to the non-link hold count on detail page

This small follow-up changes the style on the bibliographic detail page
of the hold count so that it looks similar whether it's a link to holds
or not.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 05e612525bf8d92562ae9e17904a974913819125)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>