Add rubocop spacing rules

We were following these rules in most places; we just didn't define them
anywhere.

spec/lib/user_segments_spec.rb

@@ -8,7 +8,7 @@ describe UserSegments do
   describe "#all_users" do
     it "returns all active users enabled" do
       active_user = create(:user)
-      erased_user  = create(:user, erased_at: Time.current)
+      erased_user = create(:user, erased_at: Time.current)
 
       expect(described_class.all_users).to include active_user
       expect(described_class.all_users).not_to include erased_user