slapos_panel: compatibility: restore my_news content for the client

See: https://lab.nexedi.com/nexedi/slapos.core/-/blob/5e430ca2f21110900226c351bc5f5867e1ed3afe/slapos/slap/hateoas.py#L462

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel_compatibility/InstanceTree_viewAsHateoas/my_news.xml

@@ -6,6 +6,14 @@
     </pickle>
     <pickle>
       <dictionary>
+        <item>
+            <key> <string>delegated_list</string> </key>
+            <value>
+              <list>
+                <string>default</string>
+              </list>
+            </value>
+        </item>
         <item>
             <key> <string>id</string> </key>
             <value> <string>my_news</string> </value>
@@ -91,10 +99,6 @@
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
                 </item>
-                <item>
-                    <key> <string>title</string> </key>
-                    <value> <string>Message</string> </value>
-                </item>
               </dictionary>
             </value>
         </item>