EKF: Add missing reset for output observer vertical position derivative

Required to prevent large transients in value returned by get_pos_d_deriv accessor following a vertical state reset event.

EKF/ekf_helper.cpp

@@ -300,12 +300,24 @@ void Ekf::resetHeight()
 	for (uint8_t i = 0; i < _output_buffer.get_length(); i++) {
 		if (vert_pos_reset) {
 			_output_buffer[i].pos(2) += _state_reset_status.posD_change;
+			_output_vert_buffer[i].vel_d_integ += _state_reset_status.posD_change;
 		}
 
 		if (vert_vel_reset) {
 			_output_buffer[i].vel(2) += _state_reset_status.velD_change;
+			_output_vert_buffer[i].vel_d += _state_reset_status.velD_change;
 		}
 	}
+
+	// add the reset amount to the output observer vertical position state
+	if (vert_pos_reset) {
+		_output_vert_delayed.vel_d_integ = _state.pos(2);
+		_output_vert_new.vel_d_integ = _state.pos(2);
+	}
+	if (vert_vel_reset) {
+		_output_vert_delayed.vel_d = _state.vel(2);
+		_output_vert_new.vel_d = _state.vel(2);
+	}
 }
 
 // align output filter states to match EKF states at the fusion time horizon