The command should detect an already-initialized store and fail immediately. It should not prompt the user for additional information that will never be used.
Initializing a new password store:
✗ Store is already initialized!
- Searching for usable private keys...
! Hint: Use 'gopass init <subkey> to use subkeys!'
? Please select a private key for encrypting secrets:
[...]
Please enter the number of a key (0-2, [q]uit) (q to abort) [0]: 2
Error: Failed to initialize store: failed to init store "" at "~/.local/share/gopass/stores/root": failed to initialize new sub store: found already initialized store at "~/.local/share/gopass/stores/root".
You can add secondary stores with 'gopass init --path <path to secondary store> --store <mount name>'
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