message: telemetry: fix copy-paste mistake
  Duh!
diff: @@ -606,7 +606,7 @@ void TelemetryImpl::process_attitude_quaternion(const mavlink_message_t& message
  Telemetry::Quaternion quaternion;
  quaternion.w = mavlink_attitude_quaternion.q1;
  - quaternion.x = mavlink_attitude_quaternion.q1;
  + quaternion.x = mavlink_attitude_quaternion.q2;
  quaternion.y = mavlink_attitude_quaternion.q3;
  quaternion.z = mavlink_attitude_quaternion.q4;
  