fw rate control: initialize rate control resets to false in stabilized mode

before there was a corner case where if in an auto mode that sets a reset command on the attitude setpoint message (e.g. auto takeoff), if the mode was then switched stabilized, this reset bool would never be changed back to false and the integrators would reset every cycle

src/modules/fw_att_control/FixedwingAttitudeControl.cpp

@@ -157,6 +157,8 @@ FixedwingAttitudeControl::vehicle_manual_poll(const float yaw_body)
 					Quatf q(Eulerf(_att_sp.roll_body, _att_sp.pitch_body, _att_sp.yaw_body));
 					q.copyTo(_att_sp.q_d);
 
+					_att_sp.reset_rate_integrals = false;
+
 					_att_sp.timestamp = hrt_absolute_time();
 
 					_attitude_sp_pub.publish(_att_sp);