Update Meshtastic/Crypto/XEdDSASigning.cs

Co-authored-by: Copilot <[email protected]>

Author: thebentern

Meshtastic/Crypto/XEdDSASigning.cs

@@ -50,7 +50,6 @@ public static (byte[] edPrivateKey, byte[] edPublicKey) GenerateEdDSAKeysFromX25
 
         var keyPair = keyPairGen.GenerateKeyPair();
         var privateKey = ((Ed25519PrivateKeyParameters)keyPair.Private).GetEncoded();
-        var publicKey = ((Ed25519PublicKeyParameters)keyPair.Public).GetEncoded();
         // Proper XEdDSA key derivation with domain separation
         // Ed25519 seed = SHA-512("XEdDSA" || x25519PrivateKey)[0..31]
         byte[] domain = Encoding.ASCII.GetBytes("XEdDSA");