make non-pro dummy app use deferred scripts only

Author: AbanoubGhadban

spec/dummy/app/views/layouts/application.html.erb

@@ -9,16 +9,7 @@
 
   <%= yield :head %>
 
-  <%# Conditionally use defer: true for pages with Redux shared stores (inline registration).
-      Modern apps should use async: true for optimal performance. See docs for details:
-      docs/building-features/streaming-server-rendering.md %>
-  <% if uses_redux_shared_store? %>
-    <%# defer: true required for Redux shared stores with inline component registration %>
-    <%= javascript_pack_tag('client-bundle', 'data-turbo-track': 'reload', defer: true) %>
-  <% else %>
-    <%# async: true is the recommended approach for modern apps (Shakapacker >= 8.2.0) %>
-    <%= javascript_pack_tag('client-bundle', 'data-turbo-track': 'reload', async: true) %>
-  <% end %>
+  <%= javascript_pack_tag('client-bundle', 'data-turbo-track': 'reload', defer: true) %>
 
   <%= csrf_meta_tags %>
 </head>