D23215: Port to non-deprecated KWindowSystem::setMainWindow overload

[Volker Krause]

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

REPOSITORY
  R311 KWallet

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23215

To: dfaure, zzag, vkrause
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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