Fix crash in TreeView when removing a node.

[doubleday]

When trying to remove a node in the TreeView sample the App crashes with:

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
   at System.Collections.ObjectModel.Collection`1.RemoveAt(Int32 index)
   at ControlCatalog.ViewModels.TreeViewPageViewModel.RemoveItem() in 

The reason is that SelectedItems are already updated via TreeView.OnItemsViewCollectionChanged.

TreeViewTests already asserts that this is the case.

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0049072-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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[doubleday]

@cla-avalonia agree

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[grokys]

Thanks @doubleday !