Follow-up fix for Bug 5498, Standardize markup and style of pagination menus

Follow-up fix for Bug 5498, Standardize markup and style of pagination menus

Missed a couple of instances of the pagination menu on the
lists page. Previously the pagination links on the page
listing lists (/cgi-bin/koha/virtualshelves/shelves.pl) was
unstyled. After this patch the links should be styled.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 7f884128f67125c542daae77b32108e6cf14a5a5)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>