fix(src/config.rs): use dedicated constant for default interval — radicle-ci-broker

The default doesn’t change, but it’s now called DEFAULT_QUEUE_LEN_INTERVAL instead of DEFAULT_MAX_RUN_TIME.

Signed-off-by: Lars Wirzenius liw@liw.fi

 };
 const DEFAULT_MAX_RUN_TIME: Duration = Duration::from_secs(3600);
 const DEFAULT_QUEUE_LEN_INTERVAL: Duration = Duration::from_secs(3600);
 const DEFAULT_STATUS_PAGE_UPDATE_INTERVAL: u64 = 10;
 #[derive(Debug, Serialize, Deserialize)]