[opal-0.9] Fix DSL spec

define_method define a duplicated “para” method which got the wrong one pickuped by opal 0.9

Author: zetachang

lib/react/rendering_context.rb

@@ -85,9 +85,8 @@ def self.remove_nodes_from_args(args)
   end
 
   class ::Object
-    alias_method :old_method_missing, :method_missing
 
-    ["span", "para", "td", "th", "while_loading"].each do |tag|
+    ["span", "td", "th", "while_loading"].each do |tag|
       define_method(tag) do | *args, &block |
         args.unshift(tag)
         return self.method_missing(*args, &block) if self.is_a? React::Component