fix: Fix parameterless Binding constructor not having correct defaults

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Data/Given_BindingExpression.cs

@@ -1,5 +1,6 @@
 using System.Threading.Tasks;
 using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Data;
 using Microsoft.UI.Xaml.Media;
 using Private.Infrastructure;
 using Uno.Disposables;
@@ -8,6 +9,15 @@ namespace Uno.UI.RuntimeTests.Tests.Windows_UI_Xaml_Data;
 [TestClass]
 public class Given_BindingExpression
 {
+	[TestMethod]
+	[RunsOnUIThread]
+	public async Task When_Binding_Should_Have_Correct_Default()
+	{
+		var binding = new Binding();
+		Assert.AreEqual(BindingMode.OneWay, binding.Mode);
+		Assert.AreEqual("", binding.ConverterLanguage);
+	}
+
 	[TestMethod]
 	[RunsOnUIThread]
 	public async Task When_Binding_Outer_Inner_DC_Null()

src/Uno.UI/UI/Xaml/Data/Binding.cs

@@ -52,7 +52,6 @@ public partial class Binding : BindingBase
 
 		public Binding()
 		{
-
 		}
 
 		/// <summary>
@@ -68,7 +67,6 @@ public Binding()
 			Path = path ?? new PropertyPath(String.Empty);
 			Converter = converter;
 			ConverterParameter = converterParameter;
-			Mode = BindingMode.OneWay;
 		}
 
 		public static implicit operator Binding(string path)
@@ -98,7 +96,7 @@ public static implicit operator Binding(string path)
 		/// Gets or sets a value that names the language to pass to any converter specified by the Converter property.
 		/// </summary>
 		/// <value>The converter language.</value>
-		public string ConverterLanguage { get; set; }
+		public string ConverterLanguage { get; set; } = "";
 
 		/// <summary>
 		/// Gets or sets the name of the element to use as the binding source for the Binding.
@@ -129,7 +127,7 @@ public object FallbackValue
 		/// Gets or sets a value that indicates the direction of the data flow in the binding.
 		/// </summary>
 		/// <value>The mode.</value>
-		public BindingMode Mode { get; set; }
+		public BindingMode Mode { get; set; } = BindingMode.OneWay;
 
 		/// <summary>
 		/// Gets or sets the binding source by specifying its location relative to the position of the binding target. This is most often used in bindings within XAML control templates.