Remove redundant link to download document

There's a link next to it that does the exact same thing and includes
the word "download", which was confusing in some cases since people
might think that links with different texts lead to different pages.

app/components/admin/poll/questions/answers/documents/index_component.html.erb

@@ -36,7 +36,7 @@
       <% documents.each do |document| %>
         <tr>
           <td>
-            <%= link_to document.title, document.attachment %>
+            <%= document.title %>
           </td>
           <td>
             <%= render Admin::Poll::Questions::Answers::Documents::TableActionsComponent.new(document) %>

spec/system/admin/poll/questions/answers/documents/documents_spec.rb

@@ -30,11 +30,16 @@ describe "Documents", :admin do
 
       visit admin_answer_documents_path(answer)
 
+      expect(page).not_to have_link "Download file"
+
       documentable_attach_new_file(Rails.root.join("spec/fixtures/files/clippy.pdf"))
       click_button "Save"
 
       expect(page).to have_content "Document uploaded successfully"
-      expect(page).to have_link "clippy.pdf"
+
+      within("tr", text: "clippy.pdf") do
+        expect(page).to have_link "Download file"
+      end
     end
 
     scenario "with invalid data" do