chore(tvix/store/main): address clippy

Change-Id: Ie400a7109d3aa6b66153c0ab25a38abf06984cbf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7722
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

tvix/store/src/main.rs

@@ -34,7 +34,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let cli = Cli::parse();
     let listen_address = cli
         .listen_address
-        .unwrap_or("[::]:8000".to_string())
+        .unwrap_or_else(|| "[::]:8000".to_string())
         .parse()
         .unwrap();