D23032: Remove X11Compositor requires compositing check

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REVISION SUMMARY
  With the split of the Compositor class in X11 and Wayland it is unnecessary
  to check in X11Compositor if compositing is required since on X it never is.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  rmRequireCompCheck

REVISION DETAIL
  https://phabricator.kde.org/D23032

AFFECTED FILES
  composite.cpp

To: romangg, #kwin
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