Fix clippy warnings

common/credentials/src/coconut/bandwidth.rs

@@ -215,7 +215,7 @@ mod test {
         ));
         assert!(!BandwidthVoucher::verify_against_plain(
             &voucher.get_public_attributes(),
-            &vec![],
+            &[],
         ));
         assert!(!BandwidthVoucher::verify_against_plain(
             &voucher.get_public_attributes(),

validator-api/src/coconut/deposit.rs

@@ -114,7 +114,7 @@ mod test {
             &params,
             "1234".to_string(),
             VOUCHER_INFO.to_string(),
-            tx_hash.clone(),
+            tx_hash,
             identity::PrivateKey::from_base58_string(
                 identity::KeyPair::new(&mut rng)
                     .private_key()

validator-api/src/coconut/tests.rs

@@ -139,7 +139,7 @@ async fn signed_before() {
         &params,
         "1234".to_string(),
         VOUCHER_INFO.to_string(),
-        tx_hash.clone(),
+        tx_hash,
         identity::PrivateKey::from_base58_string(
             identity::KeyPair::new(&mut rng)
                 .private_key()
@@ -335,7 +335,7 @@ async fn blind_sign_correct() {
         &params,
         "1234".to_string(),
         VOUCHER_INFO.to_string(),
-        tx_hash.clone(),
+        tx_hash,
         identity::PrivateKey::from_base58_string(
             identity::KeyPair::new(&mut rng)
                 .private_key()