Fix local tiller default enabled inconsistency

I missed this in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/35562

See also https://gitlab.com/gitlab-org/gitlab/-/issues/209736

app/controllers/clusters/base_controller.rb

@@ -7,7 +7,7 @@ class Clusters::BaseController < ApplicationController
   before_action :authorize_read_cluster!
 
   before_action do
-    push_frontend_feature_flag(:managed_apps_local_tiller, clusterable)
+    push_frontend_feature_flag(:managed_apps_local_tiller, clusterable, default_enabled: true)
   end
 
   helper_method :clusterable

changelogs/unreleased/fix-local-tiller-default-enabled.yml

+---
+title: Fix local Tiller not being default-enabled on the frontend
+merge_request: 37494
+author:
+type: fixed