public method to add/subtract from cargo bank account (#9614)

Content.Server/Cargo/Systems/CargoSystem.cs

@@ -43,4 +43,9 @@ public sealed partial class CargoSystem : SharedCargoSystem
         UpdateConsole(frameTime);
         UpdateTelepad(frameTime);
     }
+
+    public void UpdateBankAccount(StationBankAccountComponent component, int BalanceAdded)
+    {
+        component.Balance += BalanceAdded;
+    }
 }