fix(player): 增加退出清屏浮动按钮

lib/l10n/app_localizations_zh.dart

@@ -133,6 +133,9 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get clearScreen => '清屏';
 
+  @override
+  String get exitClearScreen => '退出清屏';
+
   @override
   String minutesAgo(int count) {
     return '$count 分钟前';