adding missing const

frontend/lib/modules/current_trip_map.dart

@@ -13,7 +13,7 @@ import 'package:anyway/modules/landmark_map_marker.dart';
 class CurrentTripMap extends StatefulWidget {
   final Trip? trip;
 
-  CurrentTripMap({this.trip});
+  const CurrentTripMap({super.key, this.trip});
 
   @override
   State<CurrentTripMap> createState() => _CurrentTripMapState();
@@ -22,7 +22,7 @@ class CurrentTripMap extends StatefulWidget {
 class _CurrentTripMapState extends State<CurrentTripMap> {
   late GoogleMapController mapController;
 
-  CameraPosition _cameraPosition = CameraPosition(
+  final CameraPosition _cameraPosition = const CameraPosition(
     target: LatLng(48.8566, 2.3522),
     zoom: 11.0,
   );
@@ -41,7 +41,7 @@ class _CurrentTripMapState extends State<CurrentTripMap> {
   void dispose() {
     widget.trip?.removeListener(setMapMarkers);
     widget.trip?.removeListener(setMapRoute);
-    
+
     super.dispose();
   }