Fix parameter definitions of rosserial on actuator board

[elfutzi]

Already implemented ROS parameter server with rosserial on actuator board along with default values in case parameters cant´t be found. He is always using default values.

if (!nh.getParam("/decided_thrust/thrustForewardMin", &thrustForewardMin)) { thrustForewardMin = THRUST_FOREWARD_MIN; }

Perhaps something wrong with namespace?