FIX: Should use `RAW_TEMPLATES` scope for header customizations

app/models/site_customization.rb

@@ -5,7 +5,7 @@ require_dependency 'distributed_cache'
 class SiteCustomization < ActiveRecord::Base
   ENABLED_KEY = '7e202ef2-56d7-47d5-98d8-a9c8d15e57dd'
 
-  COMPILER_VERSION = 2
+  COMPILER_VERSION = 3
 
   @cache = DistributedCache.new('site_customization')
 
@@ -55,7 +55,7 @@ PLUGIN_API_JS
       node.replace <<COMPILED
         <script>
           (function() {
-            Ember.TEMPLATES[#{name.inspect}] = #{precompiled};
+            Discourse.RAW_TEMPLATES[#{name.inspect}] = #{precompiled};
           })();
         </script>
 COMPILED