update closed UI

lib/apps/chat/detail.dart

@@ -356,6 +356,8 @@ class _ChatDetailState extends State<ChatDetail> {
                 child: Center(child: Text(lang.reconnect, style: TextStyle(color: color.primary))),
               )
             ),
+            if (friend.isClosed)
+            const SizedBox(height: 20.0),
             if (!friend.isClosed && session.online != OnlineType.Lost)
             Container(
               padding: const EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),

lib/apps/group_chat/detail.dart

@@ -351,8 +351,9 @@ class _GroupChatDetailState extends State<GroupChatDetail> {
                   );
                 }
             )),
-            if (!this.group.isClosed)
-            Container(
+            this.group.isClosed
+            ? const SizedBox(height: 20.0)
+            : Container(
               padding: const EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),
               child: Row(
                 children: [