D20013: Use Qt function for string list formatting

[Alexander Stippich]

astippich added a dependency: D19445: Handle variant list in formatting functions.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D20013

To: astippich, bruns
Cc: kde-frameworks-devel, #baloo, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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