bug: Empty 'data' folder is created in the current working directory when using bitsongd v0.21.4 CLI

Whenever the bitsongd v0.21.4 CLI is invoked, an empty 'data' folder is created in whatever the current working directory happens to be.

To reproduce the issue:

`cd <some_existing_directory>`
`ls -al` (check that no 'data' folder is present).
`bitsongd version`
`ls -al` (view the empty 'data' folder that was created).
