Bug 7160: paying fines throws error

Bug 7160: paying fines throws error

The call to ReturnLostItem in C4/Accounts was not properly namespaced to
come from C4::Circulation.  That prefix is added to the call.

To test:

Pay a fine, and confirm the error disappears (and the fines is still paid)

Signed-off-by: Brendan <brendan@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit afd2098f3c82812af7ab7366035e18b953662dab)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>