Change settings screen to use switches instead of checkboxes

lib/screens/settings_screen.dart

@@ -30,9 +30,9 @@ class SettingsScreen extends StatelessWidget {
   Widget buildLowBandwidthWidget(SettingsService settings) {
     return ListTile(
       title: const Text('Low bandwidth mode'),
-      trailing: Checkbox(
+      trailing: Switch(
         onChanged: (value) {
-          settings.lowBandwidthMode = value ?? false;
+          settings.lowBandwidthMode = value;
         },
         value: settings.lowBandwidthMode,
       ),