Suspect setMaxCartesianVelocity ought to actually call the service

[MShields1986]

Hello, Many thanks for your work on the package. I've been trying to leverage some of the features and suspect that the code here...

bool PathParametersLinService::setMaxCartesianVelocity(const geometry_msgs::Twist max_cartesian_velocity) {
  config_.request.max_cartesian_velocity = max_cartesian_velocity;
}

...ought to be...

bool PathParametersLinService::setMaxCartesianVelocity(const geometry_msgs::Twist max_cartesian_velocity) {
  config_.request.max_cartesian_velocity = max_cartesian_velocity;
  return callService();
}

...but maybe I'm missing something?