Missing format from log.Errorf

[proditis]

I missed this on the previous PR.

Not sure if there are more entries that need to be fixed like this. I did a quick grep and couldnt find any.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.97%. Comparing base (eef3a25) to head (27f2215).
⚠️ Report is 161 commits behind head on main.

Files with missing lines	Patch %	Lines
web/server.go	0.00%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #701      +/-   ##
==========================================
- Coverage   98.80%   89.97%   -8.83%     
==========================================
  Files          85       94       +9     
  Lines        5867     5358     -509     
==========================================
- Hits         5797     4821     -976     
- Misses         51      507     +456     
- Partials       19       30      +11     

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