refact cmd/crowdsec: remove redundant global variable

[mmetc]

we already have datasources a function parameter - there's no need to use the global, as long as we pass it again where needed

[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 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.13%. Comparing base (1df2c55) to head (980ef05).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/crowdsec/crowdsec.go	0.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4299      +/-   ##
==========================================
+ Coverage   63.11%   63.13%   +0.01%     
==========================================
  Files         473      473              
  Lines       33466    33467       +1     
==========================================
+ Hits        21123    21129       +6     
+ Misses      10222    10219       -3     
+ Partials     2121     2119       -2     

Flag	Coverage Δ
bats	46.56% <70.00%> (-0.01%)	⬇️
unit-linux	36.09% <0.00%> (+0.02%)	⬆️
unit-windows	24.45% <0.00%> (+<0.01%)	⬆️

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[sabban]

lgtm