Fixed scaffold generator so that it will pass on unchanged scaffolding.

Controller Test Generators were calling @instance variables for the table name despite the fact that it was defined as a singular method:
````ruby
let(:car) { cars :one }
@car.make
````
NoMethodError: undefined method `make' for nil:NilClass

I fixed them to be the same.
Removed the @ because the table_name was defined as a function instead of an instance variable.