Vault decrypted secrets fail in various ways depending on version of helm-secrets installed

[bbetter173]

When using the following DSF settings:

settings:
  vaultEnabled: true
  vaultEnvironment: demo

Helmsman fails to decrypt secrets in different ways:

Without helm-secrets >=4.0.0

CRITICAL: Error decryption failed: Decryption Done

With helm-secrets >= 4.0.0

Silent failure resulting in missing values

This is due to some logic errors in the decryptSecret function.