debug: settings reset

lib/model/settings.dart

@@ -24,6 +24,10 @@ class Settings {
     prefs = await SharedPreferences.getInstance();
   }
 
+  Future<void> reset() {
+    return prefs.clear();
+  }
+
   void addListener(SettingsCallback listener) => _listeners.add(listener);
 
   void removeListener(SettingsCallback listener) => _listeners.remove(listener);

lib/widgets/album/empty.dart

@@ -6,7 +6,7 @@ class EmptyContent extends StatelessWidget {
   Widget build(BuildContext context) {
     const color = Color(0xFF607D8B);
     return Align(
-      alignment: const FractionalOffset(.5, .3),
+      alignment: const FractionalOffset(.5, .35),
       child: Column(
         mainAxisSize: MainAxisSize.min,
         children: const [

lib/widgets/debug_page.dart

@@ -48,6 +48,13 @@ class DebugPageState extends State<DebugPage> {
             padding: const EdgeInsets.all(8),
             children: [
               const Text('Settings'),
+              RaisedButton(
+                onPressed: () async {
+                  await settings.reset();
+                  setState(() {});
+                },
+                child: const Text('Reset settings'),
+              ),
               Text('collectionGroupFactor: ${settings.collectionGroupFactor}'),
               Text('collectionSortFactor: ${settings.collectionSortFactor}'),
               Text('infoMapZoom: ${settings.infoMapZoom}'),