Bug 14890: Remove C4::Dates from circ/bookcount.pl

Bug 14890: Remove C4::Dates from circ/bookcount.pl

This patch removes deprecated C4::Dates from circ/bookcount.pl

To test:
- Search for biblio with an item that has been checked out several
  times and that has been transferred
- In left navigation click on 'Items'
- In list of items click on 'View item's checkout history'
- Verify that dates in 'Date arrived at current library' and in
  column 'Last seen' display properly.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>