D24835: [effects/presentwindows] Fix newly introduced memory leak

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  Introduced by accident in my port.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24835

AFFECTED FILES
  effects/presentwindows/presentwindows.cpp
  effects/presentwindows/presentwindows.h

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