added timetracking link

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

frontend/src/routes/task/ListTask.svelte

@@ -147,7 +147,7 @@
     {/if}
     <button class="symbol" title={t('delete_task')} onclick={deleteTask} ></button>
     <button class="symbol" title={t('add_subtask')} onclick={addSubtask}></button>
-    <a href="/time/add_task?id={task.id}">{t('timetracking')}</a>
+    <a href="/time/add_task?tid={task.id}">{t('timetracking')}</a>
     {#if error}
     <span class="error">{error}</span>
     {/if}