[PATCH] select helpers with boolean attributes

While upgrading to rails 3.0.3, I ran into the following problem:

    # blog.rb
    class Blog < ActiveRecord::Base
      # allow_comments :boolean(1) default(FALSE)
      # ...
    end
    
    # view inside a form_for(@blog)
    <%= f.select :allow_comments, [["On", true], ["Off", false]] %>

If allow_comments was true, "On" would be selected. If allow_comments was false, "Off" would NOT be selected. I've fixed this in the attached patch.