splunk: fix mapping of process command line [#918]

[pcoccoli]

Closes #918

[codecov]

Codecov Report

Merging #971 (112074c) into develop (6185d7c) will increase coverage by 0.02%.
The diff coverage is 83.33%.

@@             Coverage Diff             @@
##           develop     #971      +/-   ##
===========================================
+ Coverage    64.71%   64.73%   +0.02%     
===========================================
  Files          517      517              
  Lines        48855    48855              
===========================================
+ Hits         31617    31627      +10     
+ Misses       17238    17228      -10     

Impacted Files	Coverage Δ
.../tests/stix_translation/test_splunk_stix_to_spl.py	79.56% <83.33%> (+4.34%)	⬆️

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[mdazam1942]

Can you please resolve the conflict?