Bug 11175: Keep component part record list items inside the box

Bug 11175: Keep component part record list items inside the box

Without this the number denoting the component part item in the list
will overflow and is partly hidden.

To test:
 1) Create 100 component parts
 2) Notice without this patch the number next to the component part is
    not fully shown

Signed-off-by: Pasi Kallinen <pasi.kallinen@koha-suomi.fi>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Andrew Nugged <nugged@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>