fix --dry-run and --stats coexistence, fixes #5415

[ThomasWaldmann]

looks like the previous try to fix this was incomplete.

[codecov-io]

Codecov Report

Merging #5418 into 1.1-maint will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           1.1-maint    #5418      +/-   ##
=============================================
+ Coverage      80.25%   80.32%   +0.06%     
=============================================
  Files             27       27              
  Lines          10359    10358       -1     
  Branches        1827     1827              
=============================================
+ Hits            8314     8320       +6     
+ Misses          1534     1525       -9     
- Partials         511      513       +2     

Impacted Files	Coverage Δ
src/borg/archiver.py	82.04% <100.00%> (+0.08%)	⬆️
src/borg/archive.py	82.98% <0.00%> (+0.37%)	⬆️

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