MaxBytesForLevel considers 1MB for SSTs

In leveldb/db/version_set.cc:45:

```
static double MaxBytesForLevel(const Options* options, int level) {
// Note: the result for level zero is not really used since we set
// the level-0 compaction threshold based on number of files.

// Result for both level-0 and level-1
double result = 10. * 1048576.0;
while (level > 1) {
result *= 10;
level--;
}
return result;
}
```
Why is `result` being multiplied by 1048576 (aka 1MB)? Shouldn't it be the specified SST size?