D9221: [KLineEdit] Use Qt's built-in clear button functionality

[David Edmundson]

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

REPOSITORY
  R284 KCompletion

REVISION DETAIL
  https://phabricator.kde.org/D9221

To: broulik, #frameworks, davidedmundson
Cc: michaelh, bruns
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