Bug 10289: (follow-up) don't set cardnumber for test patron

Bug 10289: (follow-up) don't set cardnumber for test patron

Since the patron barcode is nullable, and since the tests using
the test patron don't care what the barcode is, don't set it.  This
avoids the tests failing if the test database happens to already
have a patron record with the hard-coded barcode that used
to be supplied.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 7957dd2a06cd20997f50f49aa1b77e24589ae71c)
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>