D15413: [effects/dialogparent] Fix strict mode issues

zzag created this revision.
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REVISION SUMMARY
  Modification of undeclared variables is illegal in the strict mode, e.g.
  
    mainWindows = window.mainWindows();
  
  is illegal.

TEST PLAN
  The Dialog Parent effect works with both QScriptEngine and QJSEngine.

REPOSITORY
  R108 KWin

BRANCH
  effects-dialogparent-fix-strict-mode-issues

REVISION DETAIL
  https://phabricator.kde.org/D15413

AFFECTED FILES
  effects/dialogparent/package/contents/code/main.js

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