While default.txt contains configs with UseLegacyInstructions it can't
be used by pyside-setup, while it falls back to COIN's legacy
module class.
Pick-to: 6.0
Pick-to: dev
Change-Id: I5d2856344b817f6085ba66643f47803ccee29b06
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>