some minor fixes in Database project

Bank/BankDatabaseImplement/Models/Withdrawal.cs

@@ -80,6 +80,7 @@ namespace BankDatabaseImplement.Models
                 {
                     Withdrawal = Withdrawal,
                     Account = context.Accounts.First(x => x.Id == account.Key),
+                    Sum = account.Value.Item2,
                 });
                 context.SaveChanges();
             }