message: Fix default trusting period regression
diff: @@ -318,7 +318,7 @@ pub struct ChainConfig {
  pub max_tx_size: MaxTxSize,
  #[serde(default = "default::clock_drift", with = "humantime_serde")]
  pub clock_drift: Duration,
  - #[serde(with = "humantime_serde")]
  + #[serde(default, with = "humantime_serde")]
  pub trusting_period: Option<Duration>,
  // these two need to be last otherwise we run into `ValueAfterTable` error when serializing to TOML
  