remove Uglifier call from production.rb (#6568)

config/environments/production.rb

@@ -25,7 +25,7 @@ Rails.application.configure do
   end
 
   # Compress JavaScripts and CSS.
-  config.assets.js_compressor = Uglifier.new(mangle: false)
+  # config.assets.js_compressor = Uglifier.new(mangle: false)
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.