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effects/zoom: Fix crash on X11

Vlad Zahorodnii requested to merge work/zzag/cherry-pick-zoom-effect-crash-fix into Plasma/5.27

On X11, the painted screen is meaningless, so the zoom effect doesn't use it to store offscreen data. It can create problems when iterating over offscreen data map.

The painted screen can't be used to determine the necessary offscreen texture size too. X11 requires some special care.

This change adds explicit wayland checks.

BUG: 466376 (cherry picked from commit 1854224c)

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