fix: fix wrong call to logger.exception

[raphael0202]

fixes #1440

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.74%. Comparing base (e8eed45) to head (5b0c52c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
robotoff/metrics.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1441   +/-   ##
=======================================
  Coverage   54.74%   54.74%           
=======================================
  Files          85       85           
  Lines        8635     8635           
=======================================
  Hits         4727     4727           
  Misses       3908     3908           

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