Fix typos to make tests more robust

Apparently we forgot to use the variables which meant the tests weren't
testing exactly what they were supposed to test.

spec/features/admin/valuator_groups_spec.rb

@@ -39,6 +39,7 @@ describe "Valuator groups" do
     within("#valuators") do
       expect(page).to have_link(valuator1.email, href: admin_valuator_path(valuator1))
       expect(page).to have_link(valuator2.email, href: admin_valuator_path(valuator2))
+      expect(page).not_to have_link(valuator3.email)
     end
   end
 

spec/models/poll/officer_spec.rb

@@ -41,6 +41,7 @@ describe Poll::Officer do
       create(:poll_officer_assignment, poll: poll_1, officer: officer, date: poll_1.starts_at)
       create(:poll_officer_assignment, poll: poll_1, officer: officer, date: poll_1.ends_at)
       create(:poll_officer_assignment, poll: poll_2, officer: officer)
+      create(:poll_officer_assignment, poll: poll_3, officer: officer, final: true)
 
       assigned_polls = officer.voting_days_assigned_polls
 
@@ -91,6 +92,7 @@ describe Poll::Officer do
       create(:poll_officer_assignment, poll: poll_1, officer: officer, date: poll_1.starts_at, final: true)
       create(:poll_officer_assignment, poll: poll_1, officer: officer, date: poll_1.ends_at, final: true)
       create(:poll_officer_assignment, poll: poll_2, officer: officer, final: true)
+      create(:poll_officer_assignment, poll: poll_3, officer: officer)
 
       assigned_polls = officer.final_days_assigned_polls