Bug 22851: Style navigation links in serials modules like same links in other modules

Bug 22851: Style navigation links in serials modules like same links in other modules

This patch makes minor markup changes to the serials sidebar menu
include so that links are displayed in a style consistent with similar
menus in other areas of the staff client.

This patch contains whitespace changes, so please use the "-w" flag when
viewing the diff.

To test, apply the patch and go to the Serials module. The links in the
sidebar menu should be displayed in the same style as the corresponding
menu on the Acquisitions home page.

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit b40cc9d7ac3e78fc948ca79ba0c537e4cf6c5618)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>