Bug 27168: Sort most popular by number of issues desc

Bug 27168: Sort most popular by number of issues desc

It seems that there is a weird behavior when the title is used as a
second sort

Test plan:
Turn on OpacTopissue
Make sure the table always displays entries sorted by number of issues
desc

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit b42e08029e91fdb2d3cb9a8725314236d862269c)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>