D22295: Remove scene check on repaints

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REVISION SUMMARY
  There is no need to check if a scene exists at this point. If not we
  later abort anyway because the state is not 'On'.

TEST PLAN
  Manually in X and Wayland nested session.

REPOSITORY
  R108 KWin

BRANCH
  rmSceneCheck

REVISION DETAIL
  https://phabricator.kde.org/D22295

AFFECTED FILES
  composite.cpp

To: romangg, #kwin
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