Bug 10711: make GetOfflineOperation() return $sth->fetchrow_hashref instead of $result

Bug 10711: make GetOfflineOperation() return $sth->fetchrow_hashref instead of $result

To test :
prove t/db_dependent/Circulation_OfflineOperation.t
t/db_dependent/Circulation_OfflineOperation.t .. ok
All tests successful.
Files=1, Tests=7, 19 wallclock secs ( 0.02 usr  0.01 sys +  0.24 cusr  0.02 csys =  0.29 CPU)
Result: PASS

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Comment: applied 10681 and 10710 before 10711
prove t/db_dependent/Circulation_OfflineOperation.t run without errors
koha-qa reports only 2 tabulations, fixed in a follow-up

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>