fix singular in estimated time

[louisfd]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8c80c9b) 86.54% compared to head (ab2723e) 86.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #928      +/-   ##
==========================================
- Coverage   86.54%   86.53%   -0.01%     
==========================================
  Files         469      469              
  Lines       44191    44193       +2     
==========================================
- Hits        38244    38242       -2     
- Misses       5947     5951       +4     

Files	Coverage Δ
burn-train/src/renderer/tui/progress.rs	48.78% <94.44%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

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