PERF: Preload settings, groups and badge icons in SvgSprite.

Identified as a hot path in production. Preload it early instead of
executing the queries in a live request.

lib/discourse.rb

@@ -930,6 +930,7 @@ module Discourse
 
       JsLocaleHelper.load_translations(SiteSetting.default_locale)
       Site.json_for(Guardian.new)
+      SvgSprite.preload
     end
 
     [