BAU: Remove unnecessary args to translate

We've bumped the version of the `i18n` module from 1.8.5 to 1.8.9.
Version [1.8.6](https://github.com/ruby-i18n/i18n/releases/tag/v1.8.6)
introduced a change to the parameters for the `translate` method. It
removed the `*` operator, which allows any number of args to be passed
in. These args were just discarded.

You can see the change to the source here: ruby-i18n/i18n#545

We were passing in an extra arg in a couple of places in our tests. This
removes them and prevents an `ArgumentError` being thrown.

spec/features/user_visits_select_documents_advice_page_spec.rb

@@ -63,13 +63,13 @@
 
   it "navigates to select documents page" do
     visit select_documents_advice_path
-    click_link t("hub.select_documents_advice.what_to_do_next.change_your_answers_link", select_documents_path)
+    click_link t("hub.select_documents_advice.what_to_do_next.change_your_answers_link")
     expect(page).to have_current_path(select_documents_path)
   end
 
   it "navigates to prove your identity another way page" do
     visit select_documents_advice_path
-    click_link t("hub.select_documents_advice.what_to_do_next.prove_your_identity_link", prove_your_identity_another_way_path)
+    click_link t("hub.select_documents_advice.what_to_do_next.prove_your_identity_link")
     expect(page).to have_current_path(prove_your_identity_another_way_path)
   end