fix: fix NumericUpDownBase validation propagation.

demo/Ursa.Demo/Pages/FormDemo.axaml

@@ -41,6 +41,7 @@
                         Width="300"
                         u:FormItem.Label="Email"
                         Text="{Binding Email}" />
+                    <u:NumericDoubleUpDown Value="{Binding Number}" u:FormItem.Label="Number" Width="300"/>
                 </u:FormGroup>
                 <u:FormItem Label="Please select a Date">
                     <CalendarDatePicker SelectedDate="{Binding Date}" />

demo/Ursa.Demo/ViewModels/FormDemoViewModel.cs

@@ -24,6 +24,14 @@ public partial class DataModel : ObservableObject
         get=>_name;
         set => SetProperty(ref _name, value);
     }
+
+    private double _number;
+    [Range(0.0, 10.0)]
+    public double Number
+    {
+        get => _number;
+        set => SetProperty(ref _number, value);
+    }
     
     private string _email;