[Fix] Fix LW-DETR Loss

[felixdittrich92]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.24390% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.61%. Comparing base (bc0db21) to head (4774d9f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
doctr/models/layout/lw_detr/pytorch.py	90.90%	6 Missing ⚠️
doctr/models/layout/lw_detr/base.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2068      +/-   ##
==========================================
- Coverage   96.70%   96.61%   -0.09%     
==========================================
  Files         156      156              
  Lines        7276     7411     +135     
==========================================
+ Hits         7036     7160     +124     
- Misses        240      251      +11     

Flag	Coverage Δ
unittests	96.61% <90.24%> (-0.09%)	⬇️

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