D28667: [platforms/x11] Fix valigrind warning copying window icon for windowed mode

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REVISION SUMMARY
  windowIcon.pixmap().bits() creates and deletes the QPixmap object.
  
  Which means data is dangling when we call m_winInfo->setIcon()
  
  Surprisingly harmless in real life.

TEST PLAN
  Reran kwin_wayland on X11 with valigrind

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28667

AFFECTED FILES
  plugins/platforms/x11/windowed/x11windowed_output.cpp

To: davidedmundson, #kwin
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