create --dry-run: fix display of kept tagfile, fixes #5834

[ghost]

This is a forward-port attempt of #5835. It is intended to be part of issue #5839.

[ghost]

@ThomasWaldmann How's this? I cherry picked the patch and tried to adapt it to the context used in master.

[codecov-commenter]

Codecov Report

Merging #5842 (2431351) into master (fd02923) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master    #5842   +/-   ##
=======================================
  Coverage   83.51%   83.51%           
=======================================
  Files          38       38           
  Lines       10352    10353    +1     
  Branches     1709     1710    +1     
=======================================
+ Hits         8645     8646    +1     
  Misses       1202     1202           
  Partials      505      505           

Impacted Files	Coverage Δ
src/borg/archiver.py	80.70% <66.66%> (-0.04%)	⬇️
src/borg/helpers/parseformat.py	90.30% <0.00%> (+0.16%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fd02923...2431351. Read the comment docs.

[ThomasWaldmann]

LGTM