`devnet/genesis/hash` endpoint contains trailing newline

If you do

```bash
curl -X 'GET'   'http://localhost:10000/local-cluster/api/admin/devnet/genesis/hash'   -H 'accept: */*' | wc -c
```

You will get that the output contains `65` letters instead of the expected 64! This is because there is a trailing newline returned by the command