D16661: [effects/scale] Put 'use strict' at the beginning of the script

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REVISION SUMMARY
  This removes unnecessary duplication.

TEST PLAN
  QtScript doesn't support 'use strict', so the effect still works.

REPOSITORY
  R108 KWin

BRANCH
  effects-scale-strict-mode

REVISION DETAIL
  https://phabricator.kde.org/D16661

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

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