D23540: Assure wayland output interface creation path

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REVISION SUMMARY
  The Wayland and XDG output interfaces are created or destroyed when the
  output is en- or disabled. This follows a clear path of dependencies and
  we should not check if this is indeed the case but instead assert on it.

TEST PLAN
  Nested Wayland and Drm sessions.

REPOSITORY
  R108 KWin

BRANCH
  ensureOutputCreation

REVISION DETAIL
  https://phabricator.kde.org/D23540

AFFECTED FILES
  abstract_wayland_output.cpp
  abstract_wayland_output.h

To: romangg, #kwin
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