The `type: :feature` is automatically detected by RSpec because these
tests are inside the `spec/features` folder. Using `feature` re-adds a
`type: :feature` to these files, which will result in a conflict when we
upgrade to Rails 5.1's system tests.
Because of this change, we also need to change `background` to `before`
or else these tests will fail.
How:
Using a local variable at partials to set a hidden true/false value for
`valuation` parameter on the comment creation form.
Allowing that new param at the comment controller and using it when
building a new Comment.
