wayland_server: create a new screen locker connection when the greeter gets restarted

Xaver Huglrequested to merge
work/cherry-pick-92f1fabe into Plasma/6.1

Otherwise, Wayland objects and protocol errors can cause the new instance to not start

(cherry picked from commit 92f1fabe)

Co-authored-by: Xaver Hugl xaver.hugl@gmail.com

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