tests_webui: flip leading and trailing space password test
With commit 809d9cb80f5f4471f125823888f37875aa37809e we now allow
leading and trailing space in passwords. Fix Web UI tests to follow this
change.
Fixes: https://pagure.io/freeipa/issue/8629
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>