Bug 19804: Fix test in maxsuspensiondays.t

We do not want a random value of suspension_chargeperiod from
TestBuilder

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

t/db_dependent/Circulation/IssuingRules/maxsuspensiondays.t

@@ -41,6 +41,7 @@ $builder->build(
             firstremind  => 0,
             finedays     => 2,
             lengthunit   => 'days',
+            suspension_chargeperiod => 1,
         }
     }
 );