reset the PTO count before setting the timer when dropping a PN space

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2657 into master will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2657      +/-   ##
==========================================
+ Coverage   86.37%   86.52%   +0.16%     
==========================================
  Files         122      122              
  Lines        9757     9818      +61     
==========================================
+ Hits         8427     8495      +68     
+ Misses        995      988       -7     
  Partials      335      335              

Impacted Files	Coverage Δ
internal/ackhandler/sent_packet_handler.go	73.04% <100.00%> (ø)
qlog/qlog.go	97.15% <0.00%> (+3.43%)	⬆️

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