Fix bug in previous commit.

src/client_manager.rs

@@ -15,7 +15,7 @@ fn pool_from_redisinfo(info: &TrackerRedisInfo) -> color_eyre::Result<Pool<Clien
     let new_client = Client::open(url)?;
 
     let max_pool_size = std::env::var("MAX_REDIS_POOL_SIZE")
-        .unwrap_or_else(|| "32".to_string())
+        .unwrap_or_else(|_| "32".to_string())
         .parse()
         .unwrap_or(32);