fix(flutter): 底栏右侧改为清屏

lib/pages/player/widgets/player_overlay.dart

@@ -281,14 +281,13 @@ class PlayerPlaybackOverlay extends StatelessWidget {
             ),
           ),
         ),
-        if (actions.onPip != null) ...[
-          const SizedBox(width: 8),
-          _PipButton(
-            key: const Key('player-pip'),
-            tooltip: data.l10n.pictureInPicture,
-            onPressed: actions.onPip!,
-          ),
-        ],
+        const SizedBox(width: 8),
+        _BottomIconButton(
+          key: const Key('player-bottom-clear-screen'),
+          tooltip: data.l10n.clearScreen,
+          icon: Icons.fullscreen_rounded,
+          onPressed: actions.onClear,
+        ),
       ],
     );
   }