Description
In the absense of jwt-secret file and a change in default data directory, jwt-secret file is still generated in default data directory.

Note:
check for similar behaviour if data directory is specified using env or config file.

Steps to Reproduce
In order to replicate the behavior, please provide a detailed list of steps:

1. change the default data directory using --dd <new_data_dir>
2. delete previous jwt-secret
3. ensure jwt-secret is not specified in config file or as config parameter (so it gets auto generated)

Actual behavior
jwt-secret file is generated in src/Nethermind/Nethermind.Runner/keystore.

Expected behavior
jwt-secret file should be generated in <new_data_dir>/keystore