Ticket 5063: Typo in named_scope in activerecord tests category.rb

Hey all,

Does someone want to look over a super-trivial patch I just
submitted? It's just correcting a typo; someone accidentally spelled
"group_by_title" as "gruop_by_title" in the category.rb model in the
activerecord tests. I just fixed it in the model, and in the two
places it's referenced in the habtm test.

Thanks,
Ben

It is up, thank you!