Fix progressbar descriptions

[felix0097]

Progressbar descriptions are still inconsistent:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.67%. Comparing base (df897da) to head (5570281).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   92.79%   90.67%   -2.12%     
==========================================
  Files          11       11              
  Lines         944      944              
==========================================
- Hits          876      856      -20     
- Misses         68       88      +20     

Files with missing lines	Coverage Δ
src/annbatch/io.py	90.06% <100.00%> (ø)

... and 3 files with indirect coverage changes

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