explicitely typed silent variable

lib/services/flood_station_provider.dart

@@ -18,7 +18,7 @@ class FloodStationProvider extends ChangeNotifier {
 
   /// loads all stations in batches of 500 and notifies listeners with every loop except if [silent] = true
   /// this has lower performance than loading them all at once an shouldn't be used
-  Future loadAllStationsInBatches({silent = false}) {
+  Future loadAllStationsInBatches({bool silent = false}) {
     int offset = 0;
     return Future.doWhile(() async {
       final stations = await Api.fetchStationsByRange(500, offset);
@@ -36,7 +36,7 @@ class FloodStationProvider extends ChangeNotifier {
   }
 
   /// loads all flood stations and notifies listeners when done
-  Future loadAllStations({silent = false}) {
+  Future loadAllStations({bool silent = false}) {
     return Api.fetchAllStations().then(
       (value) {
         _allStations = value;
@@ -48,7 +48,7 @@ class FloodStationProvider extends ChangeNotifier {
   }
 
   /// loads all stations whose label contains [filter]
-  Future loadFilteredStations(String filter, {silent = false}) {
+  Future loadFilteredStations(String filter, {bool silent = false}) {
     if (_filteredStationsFuture != null) {
       _filteredStationsFuture!.cancel();
     }