AP_MotorsUGV: do not limit just because of saturation

steering and throttle limit flags should only be set when there is no point in the caller passing in higher values because it will not result in an increased response.  In the case of saturation, higher inputs will still result in a higher response.

APMrover2/AP_MotorsUGV.cpp

@@ -258,17 +258,6 @@ void AP_MotorsUGV::output_skid_steering(bool armed, float steering, float thrott
     if (saturation_value > 1.0f) {
         steering_scaled = steering_scaled / saturation_value;
         throttle_scaled = throttle_scaled / saturation_value;
-        // set limits
-        if (is_negative(steering)) {
-            limit.steer_left = true;
-        } else {
-            limit.steer_right = true;
-        }
-        if (is_negative(throttle)) {
-            limit.throttle_lower = true;
-        } else {
-            limit.throttle_upper = true;
-        }
     }
 
     // add in throttle