D25127: [platforms/wayland] Do an initial xdg-surface commit

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REVISION SUMMARY
  After setting the xdg-surface role an initial commit must be sent per
  protocol description.
  
  This fixes Wayland nested session after commit 84de8d135d58 <https://phabricator.kde.org/R108:84de8d135d5807b4ea1781592ebb82230115fcd9> made this
  requirement explicit.

TEST PLAN
  Launched Wayland nested session.

REPOSITORY
  R108 KWin

BRANCH
  fix-wayland-nested-commit

REVISION DETAIL
  https://phabricator.kde.org/D25127

AFFECTED FILES
  plugins/platforms/wayland/wayland_output.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