x:Bind works for structs in OneWay but not TwoWay

[asklar]

Describe the bug

when doing TwoWay x:Bind to a struct, the code that xaml compiler generates assumes it is bound to a runtimeclass, so it uses the setter method, resulting in code like foo.MyProperty(value). For structs, it should write foo.MyProperty = value.

The getter seems correct, however, so this is an oversight.

Somewhat related to #517

Steps to reproduce the bug

<ItemsRepeater ItemsSource="{x:Bind Waffles}">
    <ItemsRepeater.ItemTemplate>
        <DataTemplate x:DataType="local:Waffle">
            <CheckBox Content="{x:Bind Name}" IsChecked="{x:Bind Enabled,Mode=TwoWay}" />
        </DataTemplate>
    </ItemsRepeater.ItemTemplate>
</ItemsRepeater>

Expected behavior

No response

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.5 Experimental 1: 1.5.231202003-experimental1

Windows version

No response

Additional context

No response

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