fileperms: bitwise permission comparison

[pro-wh]

for example, 0o466 < 0o600, but you wouldn't say it has "less" permissions as the rule is meant to check for

[codecov-commenter]

Codecov Report

Base: 74.35% // Head: 74.37% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (d39bffc) compared to base (1af1d5b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #883      +/-   ##
==========================================
+ Coverage   74.35%   74.37%   +0.01%     
==========================================
  Files          51       51              
  Lines        3178     3180       +2     
==========================================
+ Hits         2363     2365       +2     
  Misses        746      746              
  Partials       69       69              

Impacted Files	Coverage Δ
rules/fileperms.go	84.37% <100.00%> (+0.50%)	⬆️

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