D8024: Change icon for discard changes in a dialog to dialog-cancel

[Christoph Feck]

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

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8024

To: davidedmundson, cfeck
Cc: #frameworks
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