fix bad signature shadowed error

runtime/gdev/tests/integration_tests.rs

@@ -1507,7 +1507,7 @@ fn test_change_owner_key_validator_keys_set() {
         let bob = AccountKeyring::Bob.to_account_id();
         let ferdie = AccountKeyring::Ferdie.to_account_id();
         let payload = (b"icok", genesis_hash, 2u32, bob.clone()).encode();
-        let signature = AccountKeyring::Bob.sign(&payload);
+        let signature = AccountKeyring::Ferdie.sign(&payload);
 
         // Bob is not an online validator, but his identity/owner_key is already associated.
         // He should not be able to change its owner_key.
@@ -1537,7 +1537,7 @@ fn test_change_owner_key_validator_online() {
         let alice = AccountKeyring::Alice.to_account_id();
         let ferdie = AccountKeyring::Ferdie.to_account_id();
         let payload = (b"icok", genesis_hash, 1u32, alice.clone()).encode();
-        let signature = AccountKeyring::Alice.sign(&payload);
+        let signature = AccountKeyring::Ferdie.sign(&payload);
 
         // Alice is an online validator
         assert!(pallet_authority_members::OnlineAuthorities::<Runtime>::get().contains(&1));