D22970: Wayland: config update code cleanup

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: Plasma.
Herald added a project: Plasma.
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REVISION SUMMARY
  In WaylandConfig getting the current config also always updates it. Improve
  the code of that.

TEST PLAN
  Compiles, runs.

REPOSITORY
  R110 KScreen Library

BRANCH
  moreCleanupWaylandBackend

REVISION DETAIL
  https://phabricator.kde.org/D22970

AFFECTED FILES
  backends/kwayland/waylandbackend.cpp
  backends/kwayland/waylandbackend.h
  backends/kwayland/waylandconfig.cpp
  backends/kwayland/waylandconfig.h

To: romangg, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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