D25900: Inform Screens about size change

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REVISION SUMMARY
  Changes to a Wayland output that could affect the overall geometry
  need to be communicated to the Screens class.

TEST PLAN
  Compiles, runtime tested with other patches for rotation.

REPOSITORY
  R108 KWin

BRANCH
  screens-changed

REVISION DETAIL
  https://phabricator.kde.org/D25900

AFFECTED FILES
  abstract_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