fix: LEAP-938: Fix user-agent header when downloading files

[niklub]

Fixing the error:

error (rest_framework.response.Response() argument after ** must be a mapping, not NoneType) when sending Test request,

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f472671) to head (3cf9b50).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #78   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          182       182           
=========================================
  Hits           182       182           

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