Revert "summarize bank accounts"

This reverts commit a21e7f887a.

ReallifeGamemode.Server/Entities/GroupBankAccount.cs

@@ -7,8 +7,14 @@ using System.Text;
 
 namespace ReallifeGamemode.Server.Entities
 {
-    public class GroupBankAccount : BankAccount, IBankAccount
+    public class GroupBankAccount : IBankAccount
     {
+        [Key]
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public int Id { get; set; }
+
         public Group Group { get; set; }
+
+        public int Balance { get; set; }
     }
 }