Remove unused statements.

lib/playlists/playlist_home.dart

@@ -610,7 +610,6 @@ class __PlaylistsState extends State<_Playlists> {
 
   @override
   Widget build(BuildContext context) {
-    final s = context.s;
     return Selector<AudioPlayerNotifier, List<Playlist>>(
         selector: (_, audio) => audio.playlists,
         builder: (_, data, __) {

lib/playlists/playlist_page.dart

@@ -29,7 +29,6 @@ class _PlaylistDetailState extends State<PlaylistDetail> {
 
   @override
   Widget build(BuildContext context) {
-    final s = context.s;
     return Scaffold(
       appBar: AppBar(
         leading: IconButton(

lib/podcasts/podcast_manage.dart

@@ -195,7 +195,7 @@ class _PodcastManageState extends State<PodcastManage>
         ),
         body: WillPopScope(
           onWillPop: () async {
-            await context.read<GroupList>().clearOrderChanged();
+            context.read<GroupList>().clearOrderChanged();
             return true;
           },
           child: Consumer<GroupList>(

lib/settings/data_backup.dart

@@ -1038,7 +1038,6 @@ class __GpodderInfoState extends State<_GpodderInfo> {
 
   @override
   Widget build(BuildContext context) {
-    final s = context.s;
     return AnnotatedRegion<SystemUiOverlayStyle>(
       value: SystemUiOverlayStyle(
         statusBarIconBrightness: Brightness.dark,

lib/state/podcast_group.dart

@@ -434,7 +434,7 @@ class GroupList extends ChangeNotifier {
     }
     _groups = [
       for (var group in _groups)
-        if (group.id != podcastGroup) group
+        if (group.id != podcastGroup.id) group
     ];
     notifyListeners();
     await _saveGroup();

lib/widgets/dismissible_container.dart

@@ -29,7 +29,6 @@ class _DismissibleContainerState extends State<DismissibleContainer> {
   @override
   Widget build(BuildContext context) {
     final s = context.s;
-    final c = widget.episode.backgroudColor(context);
     return AnimatedContainer(
       duration: Duration(milliseconds: 300),
       curve: Curves.easeInSine,