Update 6.filter-tasks.md

Simplified declaration of `pendingTasksTitle` removing unnecessary template literal.

v3-docs/docs/tutorials/react/6.filter-tasks.md

@@ -103,9 +103,7 @@ You should avoid adding zero to your app bar when there are no pending tasks.
     TasksCollection.find(hideCompletedFilter).count()
   );
 
-  const pendingTasksTitle = `${
-    pendingTasksCount ? ` (${pendingTasksCount})` : ''
-  }`;
+  const pendingTasksTitle = pendingTasksCount ? ` (${pendingTasksCount})` : '';
 ..
 
     <h1>