pkg/parsers: light refact, remove redundant code

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.98%. Comparing base (6e7fc85) to head (0178017).

Files with missing lines	Patch %	Lines
pkg/parser/unix_parser.go	28.57%	5 Missing ⚠️
cmd/crowdsec-cli/clilapi/context.go	50.00%	0 Missing and 1 partial ⚠️
cmd/crowdsec/crowdsec.go	50.00%	0 Missing and 1 partial ⚠️
pkg/parser/runtime.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4213      +/-   ##
==========================================
- Coverage   63.01%   62.98%   -0.04%     
==========================================
  Files         470      470              
  Lines       33453    33446       -7     
==========================================
- Hits        21082    21066      -16     
- Misses      10245    10250       +5     
- Partials     2126     2130       +4     

Flag	Coverage Δ
bats	46.08% <42.85%> (-0.04%)	⬇️
unit-linux	35.90% <14.28%> (-0.10%)	⬇️
unit-windows	24.33% <14.28%> (-0.03%)	⬇️

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