Remove NET461 specific assert

tests/Avalonia.Markup.UnitTests/Data/BindingExpressionTests.cs

@@ -200,13 +200,6 @@ namespace Avalonia.Markup.UnitTests.Data
                 DefaultValueConverter.Instance);
             var result = await target.Take(1);
 
-#if NET461
-            Assert.Equal(
-                new BindingNotification(
-                    new InvalidCastException("Could not convert FallbackValue 'bar' to 'System.Int32'"),
-                    BindingErrorType.Error),
-                result);
-#else
             Assert.Equal(
                 new BindingNotification(
                     new AggregateException(
@@ -214,7 +207,6 @@ namespace Avalonia.Markup.UnitTests.Data
                         new InvalidCastException("Could not convert FallbackValue 'bar' to 'System.Int32'")),
                     BindingErrorType.Error),
                 result);
- #endif
         }
 
         [Fact]
@@ -234,13 +226,6 @@ namespace Avalonia.Markup.UnitTests.Data
                 DefaultValueConverter.Instance);
             var result = await target.Take(1);
 
-#if NET461
-            Assert.Equal(
-                new BindingNotification(
-                    new InvalidCastException("Could not convert FallbackValue 'bar' to 'System.Int32'"),
-                    BindingErrorType.Error),
-                result);
-#else
             Assert.Equal(
                 new BindingNotification(
                     new AggregateException(
@@ -248,7 +233,6 @@ namespace Avalonia.Markup.UnitTests.Data
                         new InvalidCastException("Could not convert FallbackValue 'bar' to 'System.Int32'")),
                     BindingErrorType.Error),
                 result);
-#endif
         }
 
         [Fact]