don't switch to PTO mode after using early loss detection

[marten-seemann]

No description provided.

[codecov]

Codecov Report

Merging #2581 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2581      +/-   ##
==========================================
+ Coverage   86.25%   86.31%   +0.05%     
==========================================
  Files         122      122              
  Lines        9645     9646       +1     
==========================================
+ Hits         8319     8325       +6     
+ Misses        988      981       -7     
- Partials      338      340       +2     

Impacted Files	Coverage Δ
internal/ackhandler/sent_packet_handler.go	73.18% <100.00%> (+1.20%)	⬆️

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