Fall back to client-side decoration when KDecoration init fails

Kai Uwe Broulikrequested to merge
work/kbroulik/fallback-csd-deco-fail into master

Ensures you don't end up with no decoration in case of, for exmaple a QML error in an Aurorae decoration.

Broke my Plastique decoration, got Qt’s CSD instead.

Depends on kdecoration!47 (merged)

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