D11978: [potd dataengine] Fix Wikimedia Picture of the Day provicer

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: xuetianweng.
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REVISION SUMMARY
  The used service no longer existed. While the pointers listed e.g. at
  https://commons.wikimedia.org/wiki/Commons:Press_releases/Picture_of_the_Day_RSS
  are outdated, I found a nice though seemingly proper hack in the
  code of https://github.com/simison/WikimediaCommonsPotd to first get the
  filename of the current potd and then get it fetched by Wikimedia Commons'
  Redirect/file tool.

TEST PLAN
  Select wallpaper "Picture of the Day", select as provider "Wikimedia Picture
  of the Day", click Apply and see a picture fetched, matching the one listed
  as picture of the day on the wikimedia website like
  https://commons.wikimedia.org/wiki/Commons:Picture_of_the_day

REPOSITORY
  R114 Plasma Addons

BRANCH
  fixwcpotd

REVISION DETAIL
  https://phabricator.kde.org/D11978

AFFECTED FILES
  dataengines/potd/wcpotdprovider.cpp

To: kossebau, xuetianweng
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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