Fix issue with NavigationViewItem announcing collapsed when not having children #2770
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Description
Added a check to the NavigationViewItemAutomationPeer whether the NavViewItem it represents has children or not. If the item has no children, we don't return that as the automation peer for the ExpandCollapse pattern.
Motivation and Context
Closes #2598
How Has This Been Tested?
Added new API test, tested manually with narrator
Screenshots (if appropriate):