Bug 27465: Add column visibility to admin/cities.pl

Bug 27465: Add column visibility to admin/cities.pl

We want admin/cities.pl to be using as much DT features as possible to be used as an example.

Test plan:
Add some cities, go to admin/cities.pl confirm that you can show/hide
column.

Go to the tables settings admin page and confirm that you can set some
default settings from there.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>