update replaceFromURL's user-agent to avoid TI ban

[h0m3us3r]

Updates the user-agent used for attachment downloading by url. The old one seems to be blacklisted by TI and causes #1121. This fixes it.

[codecov-io]

Codecov Report

Merging #1168 (094d08c) into master (9b15674) will decrease coverage by 0.21%.
The diff coverage is 2.89%.

@@             Coverage Diff              @@
##             master    #1168      +/-   ##
============================================
- Coverage     37.09%   36.87%   -0.22%     
- Complexity     1798     1803       +5     
============================================
  Files           258      258              
  Lines          5729     5762      +33     
============================================
  Hits           2125     2125              
- Misses         3604     3637      +33     

Impacted Files	Coverage Δ	Complexity Δ
...pr/OctoPartBundle/Controller/DefaultController.php	0.00% <0.00%> (ø)	5.00 <0.00> (+1.00)
...tKeepr/OctoPartBundle/Services/OctoPartService.php	0.00% <0.00%> (ø)	7.00 <4.00> (+4.00)
...ploadedFileBundle/Services/UploadedFileService.php	84.12% <100.00%> (ø)	13.00 <0.00> (ø)

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