transfer and legacyremote fixes

[ThomasWaldmann]

fixes #9199

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.04%. Comparing base (d676ef7) to head (7d4c05d).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/borg/legacyremote.py	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9200      +/-   ##
==========================================
+ Coverage   81.02%   81.04%   +0.02%     
==========================================
  Files          80       80              
  Lines       13778    13778              
  Branches     2056     2056              
==========================================
+ Hits        11163    11167       +4     
+ Misses       1942     1940       -2     
+ Partials      673      671       -2     

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