Bug 23446: Fix display issue in serials navigation

Bug 23446: Fix display issue in serials navigation

The serial navigation shows a little stangely on the
serial subscription detail page and other pages that show
information about a specific subscription with one of the menu items
having a different display height than the other items.

To test:
- Go to the serials module
- Add or search for an existing subscription
- Go to the subscription detail page
- Verify the display issue in the navigation on the left
- Apply patch
- Check again from different pages in the serials module
- Verify display is improved

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit d5152dfcdf9ba63fd04d0dc15f34c851e5c85836)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>