D16306: [Codecs] Remove unneeded const_cast

[Laurent Montel]

mlaurent added a reviewer: dfaure.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D16306

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