D18915: Fix batchrename changing extension to lower case

[Ahmad Samir]

ahmadsamir added a reviewer: dfaure.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D18915

To: cfoster, #dolphin, #frameworks, abalaji, dfaure
Cc: cfeck, bruns, ngraham, elvisangelaccio, chinmoyr, kde-frameworks-devel, LeGast00n, GB_2, michaelh
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