DEV: Fix build

Rails.logger is not available when Discourse.deprecate is called from
enabled_site_setting_filter.

Follow up to db46018235.

lib/discourse.rb

@@ -801,7 +801,7 @@ module Discourse
     redis_key = "deprecate-notice-#{digest}"
 
     if !Discourse.redis.without_namespace.get(redis_key)
-      Rails.logger.warn(warning) if Rails.logger
+      Rails.logger.warn(warning)
       begin
         Discourse.redis.without_namespace.setex(redis_key, 3600, "x")
       rescue Redis::CommandError => e

lib/plugin/instance.rb

@@ -626,7 +626,7 @@ class Plugin::Instance
   end
 
   def enabled_site_setting_filter(filter = nil)
-    Discourse.deprecate("`enabled_site_setting_filter` is deprecated", output_in_test: true)
+    STDERR.puts("`enabled_site_setting_filter` is deprecated")
   end
 
   def enabled_site_setting(setting = nil)