bitcoind-tests: Remove borrow

Do as clippy says, remove the borrow.

Author: tcharding

bitcoind-tests/tests/setup/test_util.rs

@@ -87,7 +87,7 @@ fn setup_keys(
     let mut x_only_pks = vec![];
 
     for sk in &sks {
-        let keypair = bitcoin::secp256k1::Keypair::from_secret_key(&secp_sign, &sk);
+        let keypair = bitcoin::secp256k1::Keypair::from_secret_key(&secp_sign, sk);
         let (xpk, _parity) = XOnlyPublicKey::from_keypair(&keypair);
         x_only_keypairs.push(keypair);
         x_only_pks.push(xpk);