message: Simplify get_timer()
  Now that we just need to determine one boolean value from
  iterating the sent packets, we can use any().
diff: @@ -400,20 +400,11 @@ impl LossRecovery {
  pub fn get_timer(&mut self, conn_state: &State) -> LossRecoveryState {
  qdebug!([self] "get_loss_detection_timer.");
  - let mut has_ack_eliciting_out = false;
  - for sp in self
  + let has_ack_eliciting_out = self
  .spaces
  .iter()
  .flat_map(|spc| self.spaces[*spc].sent_packets.values())
  - {
  - if sp.ack_eliciting {
  - has_ack_eliciting_out = true
  - }
  -
  - if has_ack_eliciting_out {
  - break;
  - }
  - }
  + .any(|sp| sp.ack_eliciting);
  qdebug!(
  [self]
  