Use anchors in comments order and pagination links

It was a bit frustrating to click on one of the order elements or the
link to the next page and having to scroll down again until reaching the
comments.

spec/system/comments/budget_investments_valuation_spec.rb

@@ -161,6 +161,7 @@ describe "Internal valuation comments on Budget::Investments" do
       end
 
       expect(page).to have_css(".comment", count: 2)
+      expect(page).to have_current_path(/#comments/, url: true)
     end
   end