Fixed a binding issue with FormsElementDriver.

This fixes the issue where form elements whose drivers inherit from FormsElementDriver would not persist their changes.

Fixes #6100, #6035

src/Orchard.Web/Modules/Orchard.Layouts/Services/IFormElementServices.cs

@@ -0,0 +1,9 @@
+using Orchard.Forms.Services;
+
+namespace Orchard.Layouts.Services {
+    public interface IFormsBasedElementServices : IDependency
+    {
+        IFormManager FormManager { get; }
+        ICultureAccessor CultureAccessor { get; }
+    }
+}