AP_Motors: remove constrain on throttle input

This constraint is redundant because we already constrain the filtered throttle

libraries/AP_Motors/AP_Motors_Class.h

@@ -62,7 +62,7 @@ public:
     void                set_roll(float roll_in) { _roll_in = roll_in; };        // range -1 ~ +1
     void                set_pitch(float pitch_in) { _pitch_in = pitch_in; };    // range -1 ~ +1
     void                set_yaw(float yaw_in) { _yaw_in = yaw_in; };            // range -1 ~ +1
-    void                set_throttle(float throttle_in) { _throttle_in = constrain_float(throttle_in,0.0f,1.0f); };   // range 0 ~ 1
+    void                set_throttle(float throttle_in) { _throttle_in = throttle_in; };   // range 0 ~ 1
     void                set_throttle_filter_cutoff(float filt_hz) { _throttle_filter.set_cutoff_frequency(filt_hz); }
 
     void                set_stabilizing(bool stabilizing) { _flags.stabilizing = stabilizing; }