D18915: Fix batchrename changing extension to lower case

[Christoph Feck]

cfeck added inline comments.

INLINE COMMENTS

> cfeck wrote in batchrenamejob.cpp:165
> Function/method names are usually lowercase. Also, we don't add `get` for getters, only `set` for setters.
> 
> ⇒ `fileExtension()` ?
> 
> Additionally, we pass QString via reference
> 
> ⇒ `QString &filename` ?

Actually, const reference:

`const QString &filename`

REPOSITORY
  R241 KIO

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

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