Use @cards.each instead of @cards.find_each

Using `find_each` ignores the scope order we set in `Widget::Card.body`,
and since we don't expect to have thousands of cards, using batches
isn't necessary.

This way we remove the "WARN Scoped order and limit are ignored, it's
forced to be batch order and batch size" message we were getting in the
specs.

app/views/welcome/_cards.html.erb

@@ -1,7 +1,7 @@
 <h3 class="title"><%= t("welcome.cards.title") %></h3>
 
 <div class="row" data-equalizer data-equalizer-on="medium">
-  <% @cards.find_each do |card| %>
+  <% @cards.each do |card| %>
     <%= render "card", card: card %>
   <% end %>
 </div>