Move set officing booth helper method calls to background block

spec/features/officing/results_spec.rb

@@ -16,6 +16,7 @@ feature "Officing Results", :with_frozen_time do
     create(:poll_question_answer, title: "Tomorrow", question: @question_2)
 
     login_as(@poll_officer.user)
+    set_officing_booth(@officer_assignment.booth)
   end
 
   scenario "Only polls where user is officer for results are accessible" do
@@ -32,8 +33,6 @@ feature "Officing Results", :with_frozen_time do
 
     expect(page).to have_content("Poll officing")
 
-    set_officing_booth(@officer_assignment.booth)
-
     within("#side_menu") do
       click_link "Total recounts and results"
     end

spec/features/officing/voters_spec.rb

@@ -12,13 +12,12 @@ feature "Voters" do
     create(:poll_shift, officer: officer, booth: booth, date: Date.current, task: :vote_collection)
     booth_assignment = create(:poll_booth_assignment, poll: poll, booth: booth)
     create(:poll_officer_assignment, officer: officer, booth_assignment: booth_assignment)
+    set_officing_booth(booth)
   end
 
   scenario "Can vote", :js do
     create(:poll_officer_assignment, officer: officer)
 
-    officer_assignment = create(:poll_officer_assignment, officer: officer)
-    set_officing_booth(officer_assignment.booth)
     visit new_officing_residence_path
     officing_verify_residence
 
@@ -40,11 +39,10 @@ feature "Voters" do
   scenario "Already voted", :js do
     poll2 = create(:poll, :current)
     booth_assignment = create(:poll_booth_assignment, poll: poll2, booth: booth)
-    officer_assignment = create(:poll_officer_assignment, officer: officer, booth_assignment: booth_assignment)
+    create(:poll_officer_assignment, officer: officer, booth_assignment: booth_assignment)
 
     user = create(:user, :level_two)
     voter = create(:poll_voter, poll: poll, user: user)
-    set_officing_booth(officer_assignment.booth)
 
     visit new_officing_voter_path(id: voter.user.id)