Bug 28367: (follow-up) Fix plack condition in C4/Auth_with_shibboleth.pm

Bug 28367: (follow-up) Fix plack condition in C4/Auth_with_shibboleth.pm

There were 2 occurrences!

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit ecb0ff8bbef93cabfd7a346254bb928a5af1a915)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 69f55189d1fa26dbe50b5c85d831a1e5df6d73c1)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
(cherry picked from commit 4579636290927942f41d63e486267c8e5e6bacb8)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>