Remove report group icon on groups list if user is already a member of the group

lib/ui/screens/groups_list_screen.dart

@@ -83,13 +83,11 @@ class _GroupsListScreenState extends SafeState<GroupsListScreen> {
                             onPressed: () => _deleteGroup(g)),
 
                         // Report button
-                        srvConfig!.isReportingEnabled
+                        srvConfig!.isReportingEnabled && !g.isAtLeastMember
                             ? IconButton(
-                                visualDensity: VisualDensity.compact,
                                 onPressed: () => _reportGroup(g),
                                 icon: Icon(
                                   Icons.flag,
-                                  size: 15.0,
                                 ),
                               )
                             : Container()