Fix issue with pathless config items

[cecinestpasunepipe]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.90%. Comparing base (6e6a546) to head (b4b3266). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dissect/target/plugins/os/unix/etc/etc.py	28.57%	5 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #785      +/-   ##
==========================================
- Coverage   77.90%   77.90%   -0.01%     
==========================================
  Files         324      324              
  Lines       27850    27852       +2     
==========================================
+ Hits        21696    21697       +1     
- Misses       6154     6155       +1     

Flag	Coverage Δ
unittests	77.90% <28.57%> (-0.01%)	:arrow_down:

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[Miauwkeru]

alternatively you can just pass config_object.entry.path to self._sub in def etc