message: Fix minifooter subfiles field
diff: @@ -811,12 +811,14 @@ void BP3Serializer::PutMinifooter(const uint64_t pgIndexStart,
  if (addSubfiles)
  {
  - position += 1;
  + const uint8_t zeros1 = 0;
  + helper::CopyToBuffer(buffer, position, &zeros1);
  helper::CopyToBuffer(buffer, position, &m_Version);
  }
  else
  {
  - position += 2;
  + const uint16_t zeros2 = 0;
  + helper::CopyToBuffer(buffer, position, &zeros2);
  }
  helper::CopyToBuffer(buffer, position, &m_Version);
  }
  