Remove "max_tlps" configuration variable

It is not used since
<#134>
(commit bdc9ac7)
was merged in 2018.

RFC 9002 also does not mention Tail Loss Probe
except that it has been integrated into the PTO (Probe Timeout)
mechanism.

quinn-proto/src/config.rs

@@ -33,7 +33,6 @@ pub struct TransportConfig {
     pub(crate) receive_window: VarInt,
     pub(crate) send_window: u64,
 
-    pub(crate) max_tlps: u32,
     pub(crate) packet_threshold: u32,
     pub(crate) time_threshold: f32,
     pub(crate) initial_rtt: Duration,
@@ -130,12 +129,6 @@ impl TransportConfig {
         self
     }
 
-    /// Maximum number of tail loss probes before an RTO fires.
-    pub fn max_tlps(&mut self, value: u32) -> &mut Self {
-        self.max_tlps = value;
-        self
-    }
-
     /// Maximum reordering in packet number space before FACK style loss detection considers a
     /// packet lost. Should not be less than 3, per RFC5681.
     pub fn packet_threshold(&mut self, value: u32) -> &mut Self {
@@ -291,7 +284,6 @@ impl Default for TransportConfig {
             receive_window: VarInt::MAX,
             send_window: (8 * STREAM_RWND).into(),
 
-            max_tlps: 2,
             packet_threshold: 3,
             time_threshold: 9.0 / 8.0,
             initial_rtt: Duration::from_millis(333), // per spec, intentionally distinct from EXPECTED_RTT
@@ -325,7 +317,6 @@ impl fmt::Debug for TransportConfig {
             .field("stream_receive_window", &self.stream_receive_window)
             .field("receive_window", &self.receive_window)
             .field("send_window", &self.send_window)
-            .field("max_tlps", &self.max_tlps)
             .field("packet_threshold", &self.packet_threshold)
             .field("time_threshold", &self.time_threshold)
             .field("initial_rtt", &self.initial_rtt)