When activating, also try token from XDG_ACTIVATION_TOKEN

Kai Uwe Broulikrequested to merge
work/kbroulik/xdg-acti-from-env into master

This matches upstream QWaylandXdgSurface behavior.

It also makes various activation magic e.g. KDBusService work.

6.4?

Prerequisite for making KRunner work

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