Fix: Edit/deleting tasks in a challenge appears possible for people who are not admin/the creator (#11349)

* Fix: introduce new prop showOptions for task component

- Pull showOptions propr from challenge container to task itself to restrict editing for non leader of challenge users

* Fix: for group plan edit/delete tasks

website/client/components/tasks/column.vue

@@ -45,6 +45,7 @@
         v-for="task in taskList",
         :key="task.id", :task="task",
         :isUser="isUser",
+        :showOptions="showOptions"
         @editTask="editTask",
         @moveTo="moveTo",
         :group='group',
@@ -311,6 +312,10 @@ export default {
     selectedTags: {},
     taskListOverride: {},
     group: {},
+    showOptions: {
+      type: Boolean,
+      default: true,
+    },
   }, // @TODO: maybe we should store the group on state?
   data () {
     const icons = Object.freeze({