D15708: [effects/slide] Delete redundant checks

zzag created this revision.
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REVISION SUMMARY
  If isActive() returns false, neither paintScreen nor paintWindow nor
  postPaintScreen will be called.
  
  So, `if (m_active)` checks are redundant.

REPOSITORY
  R108 KWin

BRANCH
  effects-slide-be-dumb

REVISION DETAIL
  https://phabricator.kde.org/D15708

AFFECTED FILES
  effects/slide/slide.cpp

To: zzag, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart