message: core: fix style, use static_cast
diff: @@ -366,10 +366,11 @@ void MAVLinkParameters::process_param_ext_value(const mavlink_message_t& message
  } else if (value.is_uint8() && work->param_value.is_uint16()) {
  // FIXME: workaround for mismatching type uint8_t which should be uint16_t.
  ParamValue correct_type_value;
  - correct_type_value.set_uint16(uint16_t(value.get_uint8()));
  + correct_type_value.set_uint16(static_cast<uint16_t>(value.get_uint8()));
  _cache[work->param_name] = correct_type_value;
  if (work->get_param_callback) {
  - work->get_param_callback(MAVLinkParameters::Result::SUCCESS, correct_type_value);
  + work->get_param_callback(
  + MAVLinkParameters::Result::SUCCESS, correct_type_value);
  }
  } else {
  LogErr() << "Param types don't match";
  