D28858: [wayland] avoid potential crash when checking for window inhibitions on desktop change

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REVISION SUMMARY
  Xwayland clients are sometimes offset from being visible to having a
  surface applied.
  
  We might also have internal windows which will be AbstractClients
  without a surface.
  
  No idle interface will be set up for non wayland clients, but on a
  desktop change we itterate through all AbstractClients and need to guard
  somewhere.
  
  BUG: 420039

TEST PLAN
  None

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28858

AFFECTED FILES
  idle_inhibition.cpp

To: davidedmundson, #kwin
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