upload: Simplify file extension extraction in UploadBase
authorThiemo Kreuz <thiemo.kreuz@wikimedia.de>
Thu, 28 Feb 2019 11:37:40 +0000 (12:37 +0100)
committerThiemo Kreuz <thiemo.kreuz@wikimedia.de>
Thu, 28 Feb 2019 11:38:52 +0000 (12:38 +0100)
The code does the exact same, just shorter and hopefully better
readable.

Change-Id: Idd1d34927a5c027d378d1a54afd23dc7f33ee004


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