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.
Before we could have multiple current budgets, as we now only have one
current_budget, some specs broke.
As there is no need to display multiple budgets to Valuators, only the
current budget is necessary, we can remove arrays and assume that only
a single budget, the current budget, is displayed to Valuators
