Move test for Javascript into Main.coffee.

src/General/Main.coffee

@@ -57,6 +57,9 @@ Main =
       $.onExists doc, 'body', false, Main.initStyle
 
   initFeatures: ->
+    if location.hostname in ['boards.4chan.org', 'sys.4chan.org']
+      $.globalEval 'document.documentElement.classList.add("js-enabled");'
+
     switch location.hostname
       when 'a.4cdn.org'
         return

src/Posting/QR.coffee

@@ -9,7 +9,6 @@ QR =
 
     return if g.VIEW is 'archive'
 
-    $.globalEval 'document.documentElement.classList.add("js-enabled");'
     noscript = Conf['Force Noscript Captcha'] or not $.hasClass doc, 'js-enabled'
     @captcha = Captcha[if noscript then 'noscript' else 'v2']