Fix regression in IBindableIterator #1690
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WinUI happens to treat
IBindableIterator(IEnumerable) andIIterator<object>(IEnumerable<object>) as the same and we maintain that for compat reasons. But CsWinRT itself doesn't assume that and does do a QI forIIterator<object>as needed which means we need to make sure that interface is also on the vtable whenIBindableIteratoris used. This was the case with JIT as both interfaces were implemented, but the WinRT exposed attribute we put didn't and this regressed.Fixes microsoft/microsoft-ui-xaml#9855