Bug 14097: Rollback issue and warning corrected

Bug 14097: Rollback issue and warning corrected

The rollback issue came from '_count' testing.
It used a 'DROP TABLE' and 'CREATE TABLE' which implicitly do autocommit.
That's why the final rollback could not be.

This patch no longer uses t::lib::TestBuilder either because it was the cause
of the warning on Comment #1 :
"DBIx::Class::Storage::txn_rollback(): A txn_rollback
in nested transaction is ineffective! (depth 1) at
t/lib/TestBuilder.pm line 308"

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Now data is preserved, no errors.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com