D8029: Use edit-delete icon for destructive discard action

[Nathaniel Graham]

ngraham added a reviewer: davidedmundson.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D8029

To: ngraham, #frameworks, #vdg, dfaure, rkflx, davidedmundson
Cc: cfeck, #frameworks