no longoer showing tasks with "no index" flag in kanban view

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/project/Kanban.svelte

@@ -159,6 +159,7 @@
             var json = await resp.json();
             for (var task_id of Object.keys(json)) {
                 let task     = json[task_id];
+                if (task.no_index) continue;
                 let state    = task.status;
                 let owner    = null;
                 let assignee = null;