message: gimbal_device_tester: fix copy paste mistake
diff: @@ -236,7 +236,7 @@ public:
  const float pitch_min =
  (gimbal_limits.pitch_min_deg != INFINITY ? gimbal_limits.pitch_min_deg : -90.0f);
  const float pitch_max =
  - (gimbal_limits.pitch_max_deg != INFINITY ? gimbal_limits.pitch_min_deg : 20.0f);
  + (gimbal_limits.pitch_max_deg != INFINITY ? gimbal_limits.pitch_max_deg : 20.0f);
  std::stringstream limit_down;
  limit_down << "Tilt " << -pitch_min << " down";
  