Add leading zeros to sensorid in toString()

lib/src/sensorid.cpp

@@ -159,7 +159,7 @@ std::string SensorId::serialize() const
 std::string SensorId::toString() const
 {
 	char buf[33];
-	snprintf(buf, sizeof(buf), "%" PRIx64 "%" PRIx64, data.raw[0], data.raw[1]);
+	snprintf(buf, sizeof(buf), "%016" PRIx64 "%016" PRIx64, data.raw[0], data.raw[1]);
 	return std::string(buf);
 }