fix: pid file work around fs.protected_regular

[eeff]

https://emqx.atlassian.net/browse/NEURON-2766

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (23523a0) 51.19% compared to head (30d7c98) 51.18%.
Report is 21 commits behind head on main.

Files	Patch %	Lines
src/daemon.c	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1684      +/-   ##
==========================================
- Coverage   51.19%   51.18%   -0.01%     
==========================================
  Files         109      109              
  Lines       20033    20035       +2     
  Branches     2567     2558       -9     
==========================================
  Hits        10255    10255              
- Misses       9511     9513       +2     
  Partials      267      267              

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