D8036: Make KStandardGuiItem::discard match QDialogButtonBox::Discard

[Christoph Feck]

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

REPOSITORY
  R252 Framework Integration

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8036

To: ngraham, davidedmundson, #frameworks, cfeck
Cc: #frameworks