Rover: disable slew limit by default on mode

APMrover2/Steering.cpp

@@ -54,13 +54,10 @@ bool Rover::in_stationary_loiter()
 void Rover::set_servos(void) {
     // Apply slew rate limit on non Manual modes
     if (control_mode == &mode_manual || control_mode == &mode_learning) {
-        g2.motors.slew_limit_throttle(false);
         if (failsafe.bits & FAILSAFE_EVENT_THROTTLE) {
             g2.motors.set_throttle(0.0f);
             g2.motors.set_steering(0.0f);
         }
-    } else {
-        g2.motors.slew_limit_throttle(true);
     }
 
     // send output signals to motors

APMrover2/mode.cpp

@@ -25,6 +25,7 @@ void Mode::exit()
 
 bool Mode::enter()
 {
+    g2.motors.slew_limit_throttle(false);
     return _enter();
 }
 

APMrover2/mode_auto.cpp

@@ -12,6 +12,7 @@ bool ModeAuto::_enter()
     auto_triggered = false;
     rover.restart_nav();
     rover.loiter_start_time = 0;
+    g2.motors.slew_limit_throttle(true);
     return true;
 }
 

APMrover2/mode_guided.cpp

@@ -9,6 +9,7 @@ bool ModeGuided::_enter()
     */
     lateral_acceleration = 0.0f;
     rover.set_guided_WP(rover.current_loc);
+    g2.motors.slew_limit_throttle(true);
     return true;
 }
 

APMrover2/mode_rtl.cpp

@@ -4,6 +4,7 @@
 bool ModeRTL::_enter()
 {
     rover.do_RTL();
+    g2.motors.slew_limit_throttle(true);
     return true;
 }