replace desktop outer scroll view with Column, so that there will be

only one scrollbar

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/common/widgets/peer_tab_page.dart

@@ -146,7 +146,7 @@ class _PeerTabPageState extends State<PeerTabPage>
               ],
             )),
           ),
-        ),
+        ).paddingOnly(right: isDesktop ? 12 : 0),
         _createPeersView(),
       ],
     );