Update DeliveryAdminWindow

Elwig/Windows/AdministrationWindow.cs

@@ -153,6 +153,14 @@ namespace Elwig.Windows {
                 OriginalValues[rb] = (rb.IsChecked ?? false) ? bool.TrueString : null;
         }
 
+        protected void SetOriginalValue(Control input, object? value) {
+            OriginalValues[input] = value;
+        }
+
+        protected void UnsetOriginalValue(Control input) {
+            OriginalValues.Remove(input);
+        }
+
         protected void ClearInputs() {
             foreach (var tb in TextBoxInputs)
                 tb.Text = "";