Persistent congestion fixes #1223
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RFC 9002 §6.2.1: When the PTO is armed for Initial or Handshake packet number spaces, the max_ack_delay in the PTO period computation is set to 0, since the peer is expected to not delay these packets intentionally.
See RFC 9002 §7.6.2.
RFC 9002 §7.6.2: A sender establishes persistent congestion after the receipt of an acknowledgment [...]
RFC 9002 §7.6.2: [..] a prior RTT sample existed when these two packets were sent.
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Minor correctness tweaks that should allow faster recovery and reduce spurious persistent congestion determinations.