Bug 23126: Remove more unnecessary linebreak processing from serial collection

Bug 23126: Remove more unnecessary linebreak processing from serial collection

This should have no visible effect on the templates as the
information the grep changes is not used in the template.

It's also strange, that these lines existed, as
GetSubscriptionsFromBiblionumber contained the same changes.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Arthur Bousquet <arthur.bousquet@inlibro.com>
Signed-off-by: Nadine Pierre <nadine.pierre@inLibro.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>