heliwatch: don't create needless new states

heliwatch/src/adsb.rs

@@ -161,7 +161,7 @@ pub fn run(host: &'static str, port: u16, locations: Locations) -> Receiver<Even
                 }
 
                 if let Some(event) = states.entry(hex.clone())
-                    .or_insert(State::new(hex.clone()))
+                    .or_insert_with(|| State::new(hex.clone()))
                     .update(&entry, &locations) {
                         events.push(event);
                     }