don't pace when congestion limited

[marten-seemann]

No description provided.

[codecov-io]

Codecov Report

Merging #1983 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1983      +/-   ##
==========================================
+ Coverage   85.34%   85.36%   +0.02%     
==========================================
  Files          99       99              
  Lines        7197     7188       -9     
==========================================
- Hits         6142     6136       -6     
+ Misses        768      767       -1     
+ Partials      287      285       -2

Impacted Files	Coverage Δ
internal/congestion/cubic_sender.go	92.2% <100%> (+0.11%)	⬆️
internal/wire/version_negotiation.go	88.24% <0%> (-11.76%)	⬇️
internal/ackhandler/sent_packet_handler.go	74.4% <0%> (-0.92%)	⬇️
internal/wire/new_connection_id_frame.go	94.12% <0%> (-0.75%)	⬇️
internal/handshake/crypto_setup.go	67.05% <0%> (-0.37%)	⬇️
internal/ackhandler/received_packet_history.go	96.67% <0%> (-0.16%)	⬇️
server.go	84.62% <0%> (+0.1%)	⬆️
client.go	80.86% <0%> (+0.67%)	⬆️
internal/wire/extended_header.go	93.6% <0%> (+0.87%)	⬆️
internal/wire/header.go	89.55% <0%> (+1.67%)	⬆️

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[marten-seemann]

#2615 is the better solution for this.