mod: 移除冗余额外横屏功能

lib/pages/setting/play_setting.dart

@@ -26,7 +26,6 @@ class _PlaySettingState extends State<PlaySetting> {
   late dynamic defaultAudioQa;
   late dynamic defaultDecode;
   late int defaultFullScreenMode;
-  late bool lockLandscape;
   late int defaultBtmProgressBehavior;
 
   @override
@@ -40,8 +39,6 @@ class _PlaySettingState extends State<PlaySetting> {
         defaultValue: VideoDecodeFormats.values.last.code);
     defaultFullScreenMode = setting.get(SettingBoxKey.fullScreenMode,
         defaultValue: FullScreenMode.values.first.code);
-    lockLandscape = setting.get(SettingBoxKey.lockLandscape,
-        defaultValue: false);
     defaultBtmProgressBehavior = setting.get(SettingBoxKey.btmProgressBehavior,
         defaultValue: BtmProgresBehavior.values.first.code);
   }
@@ -136,12 +133,6 @@ class _PlaySettingState extends State<PlaySetting> {
               }
             }
           ),
-          const SetSwitchItem(
-            title: '额外横屏',
-            subTitle: '执行播放器横屏前，额外施加屏幕旋转方向限制',
-            setKey: SettingBoxKey.lockLandscape,
-            defaultVal: false,
-          ),
           const SetSwitchItem(
             title: '开启硬解',
             subTitle: '以较低功耗播放视频',