D25129: [platforms/wayland] Use xdg-shell stable protocol

romangg created this revision.
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REVISION SUMMARY
  We support the stable xdg-shell protocol nowadays. So use this one instead of
  version 6 unstable.

TEST PLAN
  Runs with other recent patches in KWin nested. In Weston nested session still
  not yet working.

REPOSITORY
  R108 KWin

BRANCH
  wayland-nested-shell-stable

REVISION DETAIL
  https://phabricator.kde.org/D25129

AFFECTED FILES
  plugins/platforms/wayland/wayland_backend.cpp

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart