D6841: Use "document-close" as icon for KStandardAction::close

[David Faure]

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

REPOSITORY
  R265 KConfigWidgets

BRANCH
  fixdocumentcloseactionicon

REVISION DETAIL
  https://phabricator.kde.org/D6841

To: kossebau, #vdg, dfaure
Cc: #frameworks