D6941: fix plasmashell unsetting QSG_RENDER_LOOP

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D6941

To: mkoller, davidedmundson
Cc: #frameworks