Update: set last lake from persistent storage

app/lib/consts.dart

@@ -11,7 +11,6 @@ const String mapEndpoint = "update_map";
 
 // Map variables
 String selectedLake = 'Mjøsa'; // NB should be initialised to last selected lake
-
 Uint8List selectedRelation = Uint8List(0); // Initialised in init_state.dart
 List<Measurement> selectedMeasurements = [];
 List<SubDiv> selectedSubdivisions = [];

app/lib/server_requests/init_state.dart

@@ -74,8 +74,12 @@ Future<void> initialiseState(bool fetchSearchOptions) async {
         initSearchOptions();
       }
 
-      //selectedRelation = await relationFuture;
-      selectedRelation = await relationFuture; // NB update once fixed
+      // Last lake initialised to last persistent variable, or Mjøsa if the variable is not found
+      final prefs = await SharedPreferences.getInstance();
+      selectedLake = prefs.getString('lasLake') ?? "Mjøsa";
+
+      // Set the selected relation
+      selectedRelation = await relationFuture;
       selectedMeasurements = await markerListFuture;
     }
   } catch (e) {