Makes rails destroy scaffold don't duplicate routes.draw do |map| |map| when using the deprecated syntax

[rails#5263 state:committed]

Author: spastorino

railties/lib/rails/generators/actions.rb

@@ -275,7 +275,7 @@ def freeze!(args={})
       #
       def route(routing_code)
         log :route, routing_code
-        sentinel = /\.routes\.draw do(\s*\|map\|)?\s*$/
+        sentinel = /\.routes\.draw do(?:\s*\|map\|)?\s*$/
 
         in_root do
           inject_into_file 'config/routes.rb', "\n  #{routing_code}\n", { :after => sentinel, :verbose => false }