FIX: reset the delete automatic group tooltip (#31094)

Prior to this change the tooltip would forever stay even after changing
a group until you hard refresh the page.

No test as it's a very niche behavior and we have a todo to have
multiple other improvements at this codepath.

app/assets/javascripts/discourse/app/routes/group.js

@@ -12,4 +12,10 @@ export default class Group extends DiscourseRoute {
   serialize(model) {
     return { name: model.get("name").toLowerCase() };
   }
+
+  setupController(controller) {
+    super.setupController(...arguments);
+
+    controller.set("showTooltip", false);
+  }
 }