Revert "Support ScrollView keyboardDismissMode"

[licanhua]

Reverts #3665
It crashed in latest inside build and have problem to GetForUIContext

  if (Is19H1OrHigher()) {
    // 19H1 and higher supports island scenarios
    auto uiElement(xamlView.as<winrt::UIElement>());
    m_coreInputView = winrt::CoreInputView::GetForUIContext(uiElement.UIContext());
  } else {
    m_coreInputView = winrt::CoreInputView::GetForCurrentView();
  }

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[ghost]

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