D18367: [scenes/opengl] Destroy the lanczos filter when the backend is still alive

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REVISION SUMMARY
  Currently, when the lanczos filter attempts to release acquired resources,
  the backend is already gone. To fix that we have to destroy the filter
  together with SceneOpenGL2. At that moment the backend is still alive.
  
  BUG: 403370
  FIXED-IN: 5.15.0

REPOSITORY
  R108 KWin

BRANCH
  destroy-lanczos-filter-before-backend

REVISION DETAIL
  https://phabricator.kde.org/D18367

AFFECTED FILES
  plugins/scenes/opengl/scene_opengl.cpp

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