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.
The restore feature was not working properly. When pushed, the button
was removing the notification from the admins panel, but it was not
restoring in the proposal.
I added an `after_restore` function (that I missed in the first PR)
so that the notification is unmarked as moderated.
