D18915: Fix batchrename changing extension to lower case

[cfoster]

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REVISION SUMMARY
  Files renamed with Dolphins batch rename would have their file
  extensions always converted to lower case.
  
  New method of getting the file extension may not work with a right
  to left language such as Arabic
  
  Resolves: #402388

TEST PLAN
  1. Open Dolphin
  2. Create files "foo.TXT" and "bar.TXT"
  3. Batch rename (F2) to name "x"
  4. Check files are now named "x1.TXT" and "x2.TXT"

REPOSITORY
  R241 KIO

BRANCH
  FileExtensionCase (branched from master)

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

AFFECTED FILES
  src/core/batchrenamejob.cpp

To: cfoster
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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