Stop fetching timing info for unselected flights.

The flight will be redrawn when it's selected. Don't bother fetching
this info for flights that aren't selected.

resources/ui/map/map.js

@@ -714,11 +714,13 @@ class Waypoint {
           });
       });
 
+    if (this.flight.selected) {
       this.description(false).then((description) =>
         marker.bindTooltip(description, {
           permanent: zoom >= SHOW_WAYPOINT_INFO_AT_ZOOM,
         })
       );
+    }
 
     return marker;
   }