opt: appbar theme

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/setting/pages/color_select.dart

@@ -66,10 +66,7 @@ class _ColorSelectPageState extends State<ColorSelectPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        centerTitle: false,
-        title: const Text('选择应用主题'),
-      ),
+      appBar: AppBar(title: const Text('选择应用主题')),
       body: ListView(
         children: [
           Builder(

lib/pages/setting/pages/logs.dart

@@ -104,9 +104,7 @@ class _LogsPageState extends State<LogsPage> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        centerTitle: false,
-        titleSpacing: 0,
-        title: Text('日志', style: Theme.of(context).textTheme.titleMedium),
+        title: Text('日志'),
         actions: [
           PopupMenuButton<String>(
             onSelected: (String type) {

lib/pages/setting/pages/play_speed_set.dart

@@ -201,16 +201,7 @@ class _PlaySpeedPageState extends State<PlaySpeedPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        elevation: 0,
-        scrolledUnderElevation: 0,
-        titleSpacing: 0,
-        centerTitle: false,
-        title: Text(
-          '倍速设置',
-          style: Theme.of(context).textTheme.titleMedium,
-        ),
-      ),
+      appBar: AppBar(title: Text('倍速设置')),
       body: SingleChildScrollView(
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,