Arrayify error is thrown when KMS_SECRET_KEY is not specified

[moesjarraf]

At the following line the KMS_SECRET_KEY is set to a default value if it's not set:
https://github.com/ltonetwork/identity-vault/blob/main/src/setup.ts#L63

However it throws an arrayify error, probably because something is going wrong with this conversion: (SEED ? bytesToBase58(sha256(SEED)) : 'not_secret').

Temporary workaround is to set the KMS_SECRET_KEY value in the config to the value it used to have, as shown here:
543f845#diff-5d1af95661c2f11542bf816c46ed8d5f2a014b5666437e05a9f8f00647bd7df1L60