D23331: [Aurorea] Remove effective triple buffering

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REVISION SUMMARY
  KWin blits contents into a QImage raster buffer. Because of this we
  don't need our underlying GL surface to be double buffered as it
  effectively makes the whole thing tripple buffered.

TEST PLAN
  Ran Aurorae, looked the same, should save some memory

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23331

AFFECTED FILES
  plugins/kdecorations/aurorae/src/aurorae.cpp

To: davidedmundson, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart