pkg/auth/badgerauth: fix replication logs not deleting correctly

it.Item().Key() is not valid when used outside the scope of the
iteration, which in this case is txn.Delete().

Change-Id: I4491539ff567360fd1097383c4f0ec74b76c8a37

pkg/auth/badgerauth/db.go

@@ -479,7 +479,7 @@ func deleteReplicationLogEntries(txn *badger.Txn, soughtKeyHash authdb.KeyHash)
 		}
 
 		if entry.KeyHash == soughtKeyHash {
-			if err := txn.Delete(it.Item().Key()); err != nil {
+			if err := txn.Delete(it.Item().KeyCopy(nil)); err != nil {
 				return err
 			}
 		}