D17427: [effects] Don't use dynamic_cast

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REVISION SUMMARY
  qobject_cast has several advantages over dynamic_cast:
  
  - it works without RTTI;
  - it's usually faster.
  
  Also, when it comes to casting QObjects, qobject_cast is de facto
  standard.

REPOSITORY
  R108 KWin

BRANCH
  simplify-effectwindowimpl-mainwindows

REVISION DETAIL
  https://phabricator.kde.org/D17427

AFFECTED FILES
  effects.cpp

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