D18614: Fix loading of background image preview

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  50445f794b3142f29dcc043f3af83c549c694bcd <https://phabricator.kde.org/R123:50445f794b3142f29dcc043f3af83c549c694bcd> changed how wallpapers worked.
  Instead of storing an absolute path in the config we move the file and
  saves a relative path.
  
  The preview icon still expected an absolute path.
  
  This patch loads the image in the same way SDDM expects.
  
  BUG: 402930
  FIXED-IN: 5.15.0

TEST PLAN
  Set image
  Reopened KCM

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18614

AFFECTED FILES
  src/themeconfig.cpp
  src/themeconfig.h

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