Cleanup outdated metrics on multiple failed send

[soffokl]

No description provided.

[codecov-commenter]

Codecov Report

Merging #4793 (b11a41c) into master (aef85b7) will increase coverage by 0.02%.
The diff coverage is 36.36%.

@@            Coverage Diff             @@
##           master    #4793      +/-   ##
==========================================
+ Coverage   39.22%   39.25%   +0.02%     
==========================================
  Files         356      356              
  Lines       19122    19133      +11     
==========================================
+ Hits         7500     7510      +10     
- Misses      10892    10898       +6     
+ Partials      730      725       -5     

Impacted Files	Coverage Δ
core/quality/mysterium_morqa.go	59.88% <36.36%> (-2.23%)	⬇️
requests/dialer_swarm.go	72.18% <0.00%> (-5.27%)	⬇️
nat/traversal/pinger.go	80.23% <0.00%> (+5.42%)	⬆️

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