Close layer shell window if its preferred output has been removed

Vlad Zahorodniirequested to merge
work/cherry-pick-00256747 into Plasma/6.2

The given preferred output can be already removed from the Workspace when the layer shell window is created. In which case, we should close the layer shell window.

(cherry picked from commit 00256747)

Co-authored-by: Vlad Zahorodnii vlad.zahorodnii@kde.org

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