cli: show sizes in fixed width

[skshetry]

No description provided.

[codecov-commenter]

Codecov Report

Merging #21 (0e28129) into main (6d7d793) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main       #21      +/-   ##
===========================================
+ Coverage   99.93%   100.00%   +0.06%     
===========================================
  Files          28        28              
  Lines        3131      3149      +18     
  Branches      175       178       +3     
===========================================
+ Hits         3129      3149      +20     
+ Misses          1         0       -1     
+ Partials        1         0       -1     

Impacted Files	Coverage Δ
src/webdav4/cli.py	100.00% <100.00%> (+0.43%)	⬆️
tests/test_cli.py	100.00% <100.00%> (ø)

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