[wayland] Fix deploying Wayland client-side-decoration

Dmitry Kazakovrequested to merge
dkazakov/krita:kazakov/deploy-csd-for-gnome into master

It might be required on mutter/gnome.

You can select a decoration by overriding:

export QT_WAYLAND_DECORATION=bradient

or

export QT_WAYLAND_DECORATION=adwaita

Edited by Dmitry Kazakov

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