Bug 20631: Remove unused RemoveLostItem from C4::Accounts

Bug 20631: Remove unused RemoveLostItem from C4::Accounts

RemoveLostItem was 'used' in C4::Accounts, but is not
actually used there.

Call has been removed by
  commit ed9cf81c3aa8fd82f9347556364e9d2e6cef8a82
  Bug 15896 - Use Koha::Account::pay internally for makepayment

To test:
- Verify that the routine was actually not used!

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 9ccfa48f6ee8ec44d1621874383b10f68d939f34)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>