Bug 22860: Remove 1 remaining patron after authentication.t is ran

Bug 22860: Remove 1 remaining patron after authentication.t is ran

Test plan:
0/ Do not apply the patch
1/ select count(*) from borrowers;
2/ Run the tests
=> Notice that you have 1 more patron
3/ Apply the patch and repeat 1/ and 2/
=> Notice that you have the same number of patrons before and after the
tests

Signed-off-by: Hayley Mapley <hayleymapley@catalyst.net.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>