D18615: Fix mime type filter on background selection button

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  Ported to explicit QFileDialog instance instead of static method partly
  because I don't understand how to use the magic nameFilter syntax to set
  mimes, partly to ease the eventual porting to QtQuick which can't have a
  blockign dialog.
  
  BUG: 402930

TEST PLAN
  Clicked on the button
  Only image files were listed
  Selecting one still worked

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18615

AFFECTED FILES
  src/configwidgets/selectimagebutton.cpp

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