fix(flutter): 清理未使用的弹幕文案 key

lib/l10n/app_localizations_id.dart

@@ -1418,9 +1418,6 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get clearPlayback => 'Putar tanpa kontrol';
 
-  @override
-  String get danmaku => 'Komentar layar';
-
   @override
   String get danmakuUnavailable => 'Belum tersedia';