Signer allows reimporting the same Ed25119 key multiple time

[cspramit]

Issue: Signer correctly detects and disallows importing the same Secp256k1 key again but it fails to do so with Ed25119 keys.

Using the signer plugin import the same Ed25119 secret key file twice
Result: it passes the check and allows the upload

[George-cl]

@cspramit / @piotr-dziubecki I believe this is actually resolved with the latest #123 PR - feel free to test it again in case we can close this.

[cspramit]

@George-cl this is not resolved and still an issue - we can share screen if needed, we can also hack this for Secp keys too if one is pem and other cer

[George-cl]

Yeah I must have misremembered testing it - will resolve this in 1.4.0