[Kickoff] Don't enable OpacityMask layer.effect in software mode

Authored by broulik on Jan 28 2020, 10:31 AM.

Description

[Kickoff] Don't enable OpacityMask layer.effect in software mode

It won't render otherwise. The code tried to check but only disabled the outline, not the actual effect.

Differential Revision: https://phabricator.kde.org/D26958