D17944: [effects/slidingpopups] Port away from deprecated EffectWindow::desktop

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REVISION SUMMARY
  If a window is not on the current virtual desktop, then it won't be
  painted/slided. Thus, we can replace EffectWindow::desktop by
  EffectsHandler::currentDesktop.

TEST PLAN
  The effect still works correctly on both X11 and Wayland.

REPOSITORY
  R108 KWin

BRANCH
  effects-slidingpopups-port-away-from-desktop

REVISION DETAIL
  https://phabricator.kde.org/D17944

AFFECTED FILES
  effects/slidingpopups/slidingpopups.cpp

To: zzag, #kwin
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