D5450: Drop unneccessary dep on WindowSystem

[Volker Krause]

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

REPOSITORY
  R201 Akregator

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5450

To: heikobecker, #kde_pim, vkrause
Cc: dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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