feat: Fix(vote plan id ): decode from hex to bytes | NPG-000 (#599)

Decode vote plan id from hex

Author: cong-or

src/sign/src/main.rs

@@ -76,7 +76,7 @@ fn main() -> Result<(), Box<dyn Error>> {
         encrypted_vote,
         proof,
         args.proposal,
-        args.vote_plan_id.as_bytes(),
+        &hex::decode(args.vote_plan_id)?,
     )?;
 
     // fragment in hex: output consumed as input to another program