D15171: [effects] Cleanup effects handler global pointer on destruction

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TEST PLAN
  Won't make a practical difference, anything that used before
  would have crashed. Only now it's tidier.
  
  Unit tests still pass

REPOSITORY
  R108 KWin

BRANCH
  async_maximise

REVISION DETAIL
  https://phabricator.kde.org/D15171

AFFECTED FILES
  libkwineffects/kwineffects.cpp

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