Fix clippy::derivable_impls for PacingRateMode

Author: stablebits

quinn-proto/src/config/transport.rs

@@ -788,9 +788,10 @@ impl Default for MtuDiscoveryConfig {
 pub struct IdleTimeout(VarInt);
 
 /// Controls how the pacing rate is calculated
-#[derive(Debug, Clone, Copy, PartialEq)]
+#[derive(Debug, Clone, Copy, Default, PartialEq)]
 pub enum PacingRateMode {
     /// The pacing rate scales with the congestion window and inversely with RTT.
+    #[default]
     RttDependent,
 
     /// Fixed rate in bytes per second. Useful for latency-sensitive applications.
@@ -801,12 +802,6 @@ pub enum PacingRateMode {
     RttDependentWithFloor(u64),
 }
 
-impl Default for PacingRateMode {
-    fn default() -> Self {
-        Self::RttDependent
-    }
-}
-
 /// Configuration for packet pacing
 #[derive(Debug, Clone)]
 pub struct PacingConfig {