FIX: Remove unused JS from "finish installation" page (#12263)

This fixes the following error: "Uncaught ReferenceError: I18n is not defined"
The alternative would be to add `locales/#{I18n.locale}`, but the pages do not use any JS.

app/views/layouts/finish_installation.html.erb

@@ -3,8 +3,6 @@
     <%= discourse_stylesheet_link_tag 'wizard', theme_ids: nil %>
     <%= discourse_color_scheme_stylesheets %>
 
-    <%= preload_script 'ember_jquery' %>
-    <%= preload_script 'wizard-vendor' %>
     <%= render partial: "layouts/head" %>
     <title><%= t 'wizard.title' %></title>
   </head>