#19372: Consistifying ContentITem value on Model Validation Error. At the same time removing the cast from dynamic to object, since we dropped support for less than Full trust.

Work Item: 19372

--HG--
branch : 1.x

src/Orchard.Web/Modules/Orchard.CustomForms/Controllers/ItemController.cs

@@ -137,8 +137,8 @@ namespace Orchard.CustomForms.Controllers {
                     }
                 }
 
-                // Casting to avoid invalid (under medium trust) reflection over the protected View method and force a static invocation.
-                return View((object)model);
+                model.ContentItem(form);
+                return View(model);
             }
 
             contentItem.As<ICommonPart>().Container = customForm.ContentItem;