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effects: Fix QQuickItem::mapToGlobal() in qtquick effects on wayland

Vlad Zahorodnii requested to merge work/zzag/fix-qquick-item-map-to-global into master

On Wayland, we create a dummy window to fix HiDPI issues. At the moment, the QQuickRenderControl::renderWindow() returns a fixed offset 0,0.

As it turns out, QQuickItem::mapToGlobal() will poke the QQuickRenderControl::renderWindow() function to map the specified point to the global coordinate space.

Since the renderWindow() function returns hardcoded offset, the mapToGlobal() function is sort of broken in fullscreen effects.

In order to fix mapToGlobal() on Wayland, this change makes the EffectQuickRenderControl return the position of the associated OffscreenQuickView.

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