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wayland: Fix xdg-toplevel and xdg-popup window initialization

Vlad Zahorodnii requested to merge work/zzag/cherry-pick-xdg-toplevel-initialize into Plasma/5.27

Buggy clients can commit the wl_surface several times in a row. On the other hand, XdgToplevelInterface and XdgPopupInterface consider a surface to be initialized if it has been configured. If the second wl_surface commit comes before the configure event is sent, kwin will initialize a toplevel or popup twice, which can trigger asserts.

BUG: 466530 (cherry picked from commit 43cac750)

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