Revert "Proof of concept: Load controller via ES6 module in Discourse"

This reverts commit 0327f469c1.

lib/discourse_iife.rb

@@ -12,9 +12,6 @@ class DiscourseIIFE < Sprockets::Processor
     return data if (path =~ /test\_helper\.js/)
     return data if (path =~ /javascripts\/helpers\//)
 
-    # Ignore ES6 files
-    return data if (path =~ /\.es6/)
-
     # Ignore translations
     return data if (path =~ /\/translations/)
 
@@ -26,4 +23,4 @@ class DiscourseIIFE < Sprockets::Processor
     "(function () {\n\nvar $ = window.jQuery;\n// IIFE Wrapped Content Begins:\n\n#{data}\n\n// IIFE Wrapped Content Ends\n\n })(this);"
   end
 
-end
+end