Bug 22944: remove obsolete unit test

Bug 22944: remove obsolete unit test

Test 'AnonymiseIssueHistory should not return any error if success' is obsolete,
previous statement will explode if something went wrong.

Test plan :
Run t/db_dependent/Koha/Patrons.t

Signed-off-by: Arthur Bousquet <arthur.bousquet@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit ed7b3760965ec5a52783efe64bcba13b45b3725a)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>