Bug 6939 DefaultClassificationSource should be default in 942
A logic bug in the original code adding DefaultClassificationSource
caused the default not to be used (the last used value was used instead)
The bug was fixed in additem by bug 2398 but addbiblio's use
of the code was not fixed.
Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com> Signed-off-by: Paul Poulain <paul.poulain@biblibre.com> Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>