chore: slice loop replace

[testwill]

Thanks for helping us make a better snapd!
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[github-actions]

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[bboozzoo]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.79%. Comparing base (ab996a0) to head (8aad932).
Report is 225 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13962      +/-   ##
==========================================
- Coverage   78.86%   78.79%   -0.07%     
==========================================
  Files        1043     1046       +3     
  Lines      134595   136218    +1623     
==========================================
+ Hits       106144   107331    +1187     
- Misses      21837    22170     +333     
- Partials     6614     6717     +103     

Flag	Coverage Δ
unittests	78.79% <100.00%> (-0.07%)	⬇️

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