Apply Layout/LineLength rubocop rule

Note we're excluding a few files:

* Configuration files that weren't generated by us
* Migration files that weren't generated by us
* The Gemfile, since it includes an important comment that must be on
  the same line as the gem declaration
* The Budget::Stats class, since the heading statistics are a mess and
  having shorter lines would require a lot of refactoring

spec/models/poll/shift_spec.rb

@@ -5,7 +5,9 @@ describe Poll::Shift do
   let(:booth) { create(:poll_booth) }
   let(:user) { create(:user, username: "Ana", email: "ana@example.com") }
   let(:officer) { create(:poll_officer, user: user) }
-  let(:recount_shift) { build(:poll_shift, booth: booth, officer: officer, date: Date.current, task: :recount_scrutiny) }
+  let(:recount_shift) do
+    build(:poll_shift, booth: booth, officer: officer, date: Date.current, task: :recount_scrutiny)
+  end
 
   describe "validations" do
     let(:shift) { build(:poll_shift) }
@@ -37,19 +39,28 @@ describe Poll::Shift do
     it "is not valid with same booth, officer, date and task" do
       recount_shift.save!
 
-      expect(build(:poll_shift, booth: booth, officer: officer, date: Date.current, task: :recount_scrutiny)).not_to be_valid
+      expect(build(:poll_shift, booth: booth,
+                                officer: officer,
+                                date: Date.current,
+                                task: :recount_scrutiny)).not_to be_valid
     end
 
     it "is valid with same booth, officer and date but different task" do
       recount_shift.save!
 
-      expect(build(:poll_shift, booth: booth, officer: officer, date: Date.current, task: :vote_collection)).to be_valid
+      expect(build(:poll_shift, booth: booth,
+                                officer: officer,
+                                date: Date.current,
+                                task: :vote_collection)).to be_valid
     end
 
     it "is valid with same booth, officer and task but different date" do
       recount_shift.save!
 
-      expect(build(:poll_shift, booth: booth, officer: officer, date: Date.tomorrow, task: :recount_scrutiny)).to be_valid
+      expect(build(:poll_shift, booth: booth,
+                                officer: officer,
+                                date: Date.tomorrow,
+                                task: :recount_scrutiny)).to be_valid
     end
   end
 
@@ -58,7 +69,9 @@ describe Poll::Shift do
       booth_assignment1 = create(:poll_booth_assignment, booth: booth)
       booth_assignment2 = create(:poll_booth_assignment, booth: booth)
 
-      expect { create(:poll_shift, booth: booth, officer: officer, date: Date.current) }.to change { Poll::OfficerAssignment.all.count }.by(2)
+      expect do
+        create(:poll_shift, booth: booth, officer: officer, date: Date.current)
+      end.to change { Poll::OfficerAssignment.all.count }.by(2)
 
       officer_assignments = Poll::OfficerAssignment.all
       oa1 = officer_assignments.first
@@ -74,7 +87,9 @@ describe Poll::Shift do
       expect(oa2.booth_assignment).to eq(booth_assignment2)
       expect(oa2.final).to be_falsey
 
-      create(:poll_officer_assignment, officer: officer, booth_assignment: booth_assignment1, date: Date.tomorrow)
+      create(:poll_officer_assignment, officer: officer,
+                                       booth_assignment: booth_assignment1,
+                                       date: Date.tomorrow)
 
       expect { Poll::Shift.last.destroy }.to change { Poll::OfficerAssignment.all.count }.by(-2)
     end