D24780: Remove unnecessary window and button icon code

[Laurent Montel]

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

REPOSITORY
  R91 PIM: Sieve Handling Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24780

To: vkrause, mlaurent
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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