Updates admin site customization specs

app/views/admin/site_customization/content_blocks/index.html.erb

@@ -32,7 +32,7 @@
         <td><%= link_to "#{content_block.name} (#{content_block.locale})", edit_admin_site_customization_content_block_path(content_block) %></td>
         <td><%= content_block.body.html_safe %></td>
         <td>
-          <%= button_to t("admin.site_customization.content_blocks.index.delete"),
+          <%= link_to t("admin.site_customization.content_blocks.index.delete"),
                         admin_site_customization_content_block_path(content_block),
                         method: :delete, class: "button hollow alert" %>
         </td>

spec/features/admin/site_customization/content_blocks_spec.rb

@@ -88,7 +88,7 @@ feature "Admin custom content blocks" do
       expect(page).to have_content("#{block.name} (#{block.locale})")
       expect(page).to have_content(block.body)
 
-      click_button "Delete block"
+      click_link "Delete block"
 
       expect(page).not_to have_content("#{block.name} (#{block.locale})")
       expect(page).not_to have_content(block.body)
@@ -98,7 +98,7 @@ feature "Admin custom content blocks" do
       block = create(:site_customization_content_block)
       visit edit_admin_site_customization_content_block_path(block)
 
-      click_button "Delete block"
+      click_link "Delete block"
 
       expect(page).not_to have_content("#{block.name} (#{block.locale})")
       expect(page).not_to have_content(block.body)

spec/features/admin/site_customization/pages_spec.rb

@@ -63,7 +63,7 @@ feature "Admin custom pages" do
     custom_page = create(:site_customization_page, title: "An example custom page")
     visit edit_admin_site_customization_page_path(custom_page)
 
-    click_button "Delete page"
+    click_link "Delete page"
 
     expect(page).not_to have_content("An example custom page")
   end