D6273: [tabbox] Fix casts to Client where it should be AbstractClient

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  fix-tabbox-wayland-client-5.10

REVISION DETAIL
  https://phabricator.kde.org/D6273

To: graesslin, #kwin, #plasma, davidedmundson
Cc: plasma-devel, kwin, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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