Plane: remove unnecessary call to setTakeoffExpected

This is already set from inside Plane::set_servos_controlled when throttle up and or launch accel is detected.

ArduPlane/takeoff.cpp

@@ -60,9 +60,6 @@ bool Plane::auto_takeoff_check(void)
         }
     }
 
-    // let EKF know to start GSF yaw estimator before takeoff movement starts so that yaw angle is better estimated
-    plane.ahrs.setTakeoffExpected(arming.is_armed());
-
     // we've reached the acceleration threshold, so start the timer
     if (!takeoff_state.launchTimerStarted) {
         takeoff_state.launchTimerStarted = true;