D15614: remove usage of own TString to QString conversion function

[Sune Vuorela]

svuorela accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R286 KFileMetaData

BRANCH
  taglib_extractor_string_conversion

REVISION DETAIL
  https://phabricator.kde.org/D15614

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