fix CommandError args, fixes #8029

[ThomasWaldmann]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (2812f99) 82.56% compared to head (c2e7b7c) 82.61%.
Report is 2 commits behind head on 1.4-maint.

Files	Patch %	Lines
src/borg/archiver.py	50.00%	3 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##           1.4-maint    #8033      +/-   ##
=============================================
+ Coverage      82.56%   82.61%   +0.04%     
=============================================
  Files             38       38              
  Lines          10899    10899              
  Branches        2083     2083              
=============================================
+ Hits            8999     9004       +5     
+ Misses          1343     1341       -2     
+ Partials         557      554       -3     

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