D20153: Move keep-above clients to the Normal layer when showing desktop

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REVISION SUMMARY
  Implementation of the Show Desktop feature moves desktop windows to
  the Above layer, but it doesn't take into account existing clients
  that belong to the Above layer. If there are any, we have to move
  them to a layer below (e.g. normal), otherwise those clients will be
  visible when showing the desktop.
  
  BUG: 406101

REPOSITORY
  R108 KWin

BRANCH
  move-keep-above-clients-to-normal-layer

REVISION DETAIL
  https://phabricator.kde.org/D20153

AFFECTED FILES
  abstract_client.cpp
  workspace.cpp

To: zzag, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart