API: don't present an API menu entry if not subscribed

assets/javascripts/discourse/templates/admin-wizards.hbs

@@ -2,7 +2,7 @@
   {{nav-item route="adminWizardsWizard" label="admin.wizard.nav_label"}}
   {{nav-item route="adminWizardsCustomFields" label="admin.wizard.custom_field.nav_label"}}
   {{nav-item route="adminWizardsSubmissions" label="admin.wizard.submissions.nav_label"}}
-  {{#if siteSettings.wizard_apis_enabled}}
+  {{#if subscribed}}
     {{nav-item route="adminWizardsApi" label="admin.wizard.api.nav_label"}}
   {{/if}}
   {{nav-item route="adminWizardsLogs" label="admin.wizard.log.nav_label"}}

controllers/custom_wizard/admin/admin.rb

@@ -4,6 +4,7 @@ class CustomWizard::AdminController < ::Admin::AdminController
 
   def index
     render_json_dump(
+      subscribed: CustomWizard::Subscription.subscribed?,
       notices: ActiveModel::ArraySerializer.new(
         CustomWizard::Notice.list,
         each_serializer: CustomWizard::NoticeSerializer