naming of downloaded files is not respected

[tiborsimko]

Current behaviour

When I try to download a file that is linked by the file index through the web interface, the name of the downloaded file does not respect the original file name of the data as they are preserved in the repository.

How to reproduce the problem:

1. Open https://opendata.cern.ch/record/1
2. Click on the first "List files" button next to "CMS_Run2010B_BTau_AOD_Apr21ReReco-v1_0000_file_index.json"
3. Download first file named "00E16FBB-9071-E011-83D3-003048673F12.root"
4. The downloaded file will be named "CMS_Run2010B_BTau_AOD_Apr21ReReco-v1_0000_file_index.json_0" instead of how the file is actually named.

$ ls -lrt ~/Downloads
-rw-r--r--  1 tibor tibor   611324720 Dec 18 11:19 CMS_Run2010B_BTau_AOD_Apr21ReReco-v1_0000_file_index.json_0

Expected behaviour

The downloaded file should be named exactly as is preserved in the repository, i.e. "00E16FBB-9071-E011-83D3-003048673F12.root".