opt: appbar theme

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

lib/pages/setting/privacy_setting.dart

@@ -38,14 +38,7 @@ class _PrivacySettingState extends State<PrivacySetting> {
         .labelMedium!
         .copyWith(color: Theme.of(context).colorScheme.outline);
     return Scaffold(
-      appBar: AppBar(
-        centerTitle: false,
-        titleSpacing: 0,
-        title: Text(
-          '隐私设置',
-          style: Theme.of(context).textTheme.titleMedium,
-        ),
-      ),
+      appBar: AppBar(title: Text('隐私设置')),
       body: Column(
         children: [
           ListTile(