D7077: Drop Client::cap_deco as it's nowhere used

[Marco Martin]

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

REPOSITORY
  R108 KWin

BRANCH
  client-no-cap-deco

REVISION DETAIL
  https://phabricator.kde.org/D7077

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