Fix connection close log

[at-wat]

Printf arguments weren't passed to the logger.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (21d18f5) 78.45% compared to head (7fa595a) 78.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #605      +/-   ##
==========================================
+ Coverage   78.45%   78.50%   +0.04%     
==========================================
  Files          42       42              
  Lines        4387     4387              
==========================================
+ Hits         3442     3444       +2     
+ Misses        730      727       -3     
- Partials      215      216       +1     

Flag	Coverage Δ
go	78.50% <100.00%> (+0.04%)	⬆️
wasm	22.32% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
gather.go	66.78% <100.00%> (ø)

... and 3 files with indirect coverage changes

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