Fix schema.rb some more. sponsors.sponsorable_type should be a string. References #4756.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9073 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/test/schema/schema.rb

@@ -422,6 +422,6 @@ ActiveRecord::Schema.define do
   create_table :sponsors, :force => true do |t|
     t.integer :club_id
     t.integer :sponsorable_id
-    t.integer :sponsorable_type
+    t.string :sponsorable_type
   end
 end