Fixed bug#7015 - Closing split ticked assigned to different agents causes "Locked Tickets Total" to be negative (or off by one).
Fixed bug#7015 - Closing split ticked assigned to different agents causes "Locked Tickets Total" to be negative (or off by one).

djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test,djoudi/otrs-gitimport-test