Fix regression introduced in https://github.com/tgxworld/discourse/commit/8cf0f51eb2c9ef5c6155d77aab1d0d9c7b104af0.

app/serializers/admin_plugin_serializer.rb

@@ -30,11 +30,11 @@ class AdminPluginSerializer < ApplicationSerializer
   end
 
   def include_enabled_setting?
-    object.enabled_site_setting
+    enabled_setting.present?
   end
 
   def enabled_setting
-    true
+    object.enabled_site_setting
   end
 
   def include_enabled_setting_filter?

spec/serializers/admin_plugin_serializer_spec.rb

@@ -0,0 +1,14 @@
+require 'rails_helper'
+
+RSpec.describe AdminPluginSerializer do
+  let(:instance) { Plugin::Instance.new }
+
+  subject { described_class.new(instance) }
+
+  describe 'enabled_setting' do
+    it 'should return the right value' do
+      instance.enabled_site_setting('test')
+      expect(subject.enabled_setting).to eq('test')
+    end
+  end
+end