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.
Change-Id: I5d2856344b817f6085ba66643f47803ccee29b06
Reviewed-by: Jani Heikkinen <jani.heikkinen@qt.io>
(cherry picked from commit 32d8d76755)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>