Bug 21722: Use Koha::Account->add_debit in chargelostitem

Bug 21722: Use Koha::Account->add_debit in chargelostitem

This patch updates C4::Accounts::chargelostitem to use the newly
available add_debit method from Koha::Account.

Known Side Effects: If the FinesLog is enabled then the 'action'
recorded will change from the generic `create_fee` (for both the lost
charge and any associated processing charge) to the more descriptive
terms `create_processing` and `create_lost_item`.

Sponsored-by: PTFS Europe
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>