D15714: add a string suffix to test data and use for unicode testing of taglibwriter

[Alexander Stippich]

astippich added a dependency: D15704: increase test coverage of taglibwriter.

REPOSITORY
  R286 KFileMetaData

REVISION DETAIL
  https://phabricator.kde.org/D15714

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