D17716: [effects] Make current OpenGL context per each unloaded effect

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REVISION SUMMARY
  Some effects may release the current context when they tear down, so we
  have to make the current context per each unloaded effect.
  
  BUG: 396830
  FIXED-IN: 5.15.0

TEST PLAN
  No longer able to reproduce bug 396830.

REPOSITORY
  R108 KWin

BRANCH
  make-opengl-current-context-for-each-unloaded-effect

REVISION DETAIL
  https://phabricator.kde.org/D17716

AFFECTED FILES
  effects.cpp
  effects.h

To: zzag, #kwin
Cc: kwin, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart