remove useless hash

we don't really need this hash.

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -1106,7 +1106,7 @@ def collection_name
           end
 
           def resource_scope
-            { :controller => controller }
+            controller
           end
 
           alias :collection_scope :path
@@ -1684,7 +1684,7 @@ def resource_scope(kind, resource) #:nodoc:
             @nesting.push(resource)
 
             with_scope_level(kind) do
-              controller_scope(parent_resource.resource_scope[:controller]) { yield }
+              controller_scope(parent_resource.resource_scope) { yield }
             end
           ensure
             @nesting.pop