convert stylesheet path to absolute file url

Author: gr8bit

lib/critical_path_css/rails/config_loader.rb

@@ -24,7 +24,7 @@ def format_css_paths
         if config['css_paths']
           config['css_paths'].map! { |path| format_path(path) }
         else
-          config['css_paths'] = [ActionController::Base.helpers.stylesheet_path(config['manifest_name'], host: '')]
+          config['css_paths'] = [format_path(ActionController::Base.helpers.stylesheet_path(config['manifest_name'], host: ''))]
         end
       end