simplify unix socket permission format

[cyberb]

Pull Request Checklist

• I have added Go unit tests or Complement integration tests for this PR or I have justified why this PR doesn't need tests
• Pull request includes a sign off below using a legally identifiable name or I have already signed off privately

Signed-off-by: Boris Rybalkin <[email protected]>

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (2c58bab) 63.36% compared to head (405a324) 63.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3014      +/-   ##
==========================================
- Coverage   63.36%   63.35%   -0.02%     
==========================================
  Files         496      496              
  Lines       53830    53833       +3     
==========================================
- Hits        34110    34105       -5     
- Misses      16021    16028       +7     
- Partials     3699     3700       +1     

Flag	Coverage Δ
unittests	42.91% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/dendrite/main.go	84.28% <ø> (+1.18%)	⬆️
setup/config/config_address.go	100.00% <100.00%> (ø)

... and 9 files with indirect coverage changes

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[S7evinK]

Thanks!