Fix ReducedWongWangExcInh parameter tau_i
Created by: neich
Parameter tau_i has a minimum of 50.0 which prevents its initialization to the default value of 10.0 (value used in Deco 2014)
Created by: neich
Parameter tau_i has a minimum of 50.0 which prevents its initialization to the default value of 10.0 (value used in Deco 2014)